How to fix Task 'Internet Calendar Subscriptions' reported error (0xEB404005)

Question

How to fix Task 'Internet Calendar Subscriptions' reported error (0xEB404005)

Tekeshe, Malconm 0

I keep receiving the below error on Outlook and need help on how to resolve it.

Task 'Internet Calendar Subscriptions' reported error (0xEB404005) : 'Cannot verify or add the calendar to Outlook. Make sure the following link is a valid calendar link:

https://services.parentseveningsystem.co.uk/ical/calendar/<Removed PII>/parents/<Removed PII>/<Removed PII>'

Pat Klocke 15 Reputation points

2026-01-09T18:30:53.78+00:00

i have had this same problem for some time and none of above addresses the issues. even if I find the appts and delete them, they just pop right back up.
Vergil-V 13,220 Reputation points Microsoft External Staff Moderator

2026-01-12T09:40:36.7166667+00:00

Hi @Pat Klocke
Thank you for sharing.

Based on my research regarding error code 0x0004003D, which occurs when a DTEND property is missing, you may need to remove the affected event from the original calendar and then remove and re-add the calendar in Outlook on the web to check if the issue persists.

For similar cases reported by other users, you can refer to: Outlook Error 0x00042000 and 0x0004003D - Microsoft Q&A

I hope this helps.
Pat Klocke 15 Reputation points

2026-01-12T14:11:02.65+00:00

Yes.. Tried that numerous times (from outlook calendar). Technically you are correct, but deleting those appts in outlook did not work. As it turns out, I am linking my Google calendar to outlook. Deleting those appts in the outlook app, directly, would not work. But, interestingly, deleting them directly out of the Google calendar did. It would be helpful if the error was lest cryptic as well as directing me to the source calendar causing the issue. Unsure why deleting them via the outlook app would not work. I mean, outlook showed them deleted when I deleted them, but then next send/receive they would be back, which was my clue (I do keep appts in both calendars so did not realize it was a source calendar issue nor did the error help push me in that direction). Suggest MS possibly add that suggestion to their online help for this type of error. Ie, "it appears the issue is with appts sync from an iCal or external calendar. Try deleting them directly from the native application..." blah blah.... I should add that when I searched for error on 0x0004003D, I was not offered the source you suggested as where I might find my solution. Lots of others, but nothing mentioning internet calendars as issue. (nor did the AI suggested solution. Had me jumping thru a lot of needless hoops. But I thank you for the response.
Vergil-V 13,220 Reputation points Microsoft External Staff Moderator

2026-01-12T14:25:16.9433333+00:00

Hi @Pat Klocke
Thank you for sharing.

This is a great insight for other users who may encounter a similar situation.

Additionally, regarding your suggestion, I highly recommend sharing your feedback through Ideas · Community

This is the official channel for submitting suggestions, and it ensures that your feedback reaches Microsoft’s development team, where it can help shape future updates and improve the overall experience.

Your feedback is valuable and truly appreciated.

Once again, thank you for your time and contribution.
Aquino, Renato 5 Reputation points

2026-01-23T12:28:11.41+00:00

@Pat Klocke

Obrigado pela dica, resolveu meu problema!

Att
Deleted

This comment has been deleted due to a violation of our Code of Conduct. The comment was manually reported or identified through automated detection before action was taken. Please refer to our Code of Conduct for more information.
Chris Partridge 0 Reputation points

2026-03-23T17:23:02.0633333+00:00

Just had a user with this issue. At some time in the past, he had subscribed to the school calendar where his wife works. Now he was randomly getting an error that he needed to repair one of his files:

I just went into his Account Settings in Outlook and Removed the calendar from the Internet Calendars tab:

3 answers

Your answer

Pat Klocke 15 Reputation points

2026-01-09T18:30:53.78+00:00

i have had this same problem for some time and none of above addresses the issues. even if I find the appts and delete them, they just pop right back up.
Vergil-V 13,220 Reputation points Microsoft External Staff Moderator

2026-01-12T09:40:36.7166667+00:00

Hi @Pat Klocke
Thank you for sharing.

Based on my research regarding error code 0x0004003D, which occurs when a DTEND property is missing, you may need to remove the affected event from the original calendar and then remove and re-add the calendar in Outlook on the web to check if the issue persists.

For similar cases reported by other users, you can refer to: Outlook Error 0x00042000 and 0x0004003D - Microsoft Q&A

I hope this helps.
Pat Klocke 15 Reputation points

2026-01-12T14:11:02.65+00:00

Yes.. Tried that numerous times (from outlook calendar). Technically you are correct, but deleting those appts in outlook did not work. As it turns out, I am linking my Google calendar to outlook. Deleting those appts in the outlook app, directly, would not work. But, interestingly, deleting them directly out of the Google calendar did. It would be helpful if the error was lest cryptic as well as directing me to the source calendar causing the issue. Unsure why deleting them via the outlook app would not work. I mean, outlook showed them deleted when I deleted them, but then next send/receive they would be back, which was my clue (I do keep appts in both calendars so did not realize it was a source calendar issue nor did the error help push me in that direction). Suggest MS possibly add that suggestion to their online help for this type of error. Ie, "it appears the issue is with appts sync from an iCal or external calendar. Try deleting them directly from the native application..." blah blah.... I should add that when I searched for error on 0x0004003D, I was not offered the source you suggested as where I might find my solution. Lots of others, but nothing mentioning internet calendars as issue. (nor did the AI suggested solution. Had me jumping thru a lot of needless hoops. But I thank you for the response.
Vergil-V 13,220 Reputation points Microsoft External Staff Moderator

2026-01-12T14:25:16.9433333+00:00

Hi @Pat Klocke
Thank you for sharing.

This is a great insight for other users who may encounter a similar situation.

Additionally, regarding your suggestion, I highly recommend sharing your feedback through Ideas · Community

This is the official channel for submitting suggestions, and it ensures that your feedback reaches Microsoft’s development team, where it can help shape future updates and improve the overall experience.

Your feedback is valuable and truly appreciated.

Once again, thank you for your time and contribution.
Aquino, Renato 5 Reputation points

2026-01-23T12:28:11.41+00:00

@Pat Klocke

Obrigado pela dica, resolveu meu problema!

Att
Deleted

This comment has been deleted due to a violation of our Code of Conduct. The comment was manually reported or identified through automated detection before action was taken. Please refer to our Code of Conduct for more information.
Chris Partridge 0 Reputation points

2026-03-23T17:23:02.0633333+00:00

Just had a user with this issue. At some time in the past, he had subscribed to the school calendar where his wife works. Now he was randomly getting an error that he needed to repair one of his files:

I just went into his Account Settings in Outlook and Removed the calendar from the Internet Calendars tab:

Answer 1

Chris Partridge 0

Go into Account Settings in Outlook and Remove the calendar from the Internet Calendars tab: User's image

0 comments

Answer 2

Vergil-V 13,220 Microsoft External Staff Moderator

Please note that our forum is a public platform, and we will modify your question to hide your personal information in the description. Kindly ensure that you hide any personal or organizational information the next time you post an error or other details to protect personal data.
Hi @Tekeshe, Malconm
Thanks for reaching out to the Microsoft Q&A forum.
Besides using Outlook on the web (OWA) to import your Internet calendar by URL as a workaround for the error message “Cannot verify or add the calendar to Outlook” in Classic Outlook, you can also try the following options:

You could create a new Outlook profile, as reported by other users, which may help resolve the issue.
Reference: Outlook 365 error for Internet Calendar Subscription - Microsoft Q&A

For step-by-step instructions on how to create a new Outlook profile, please refer to the image below and the article: Create an Outlook profile - Microsoft Support

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I sincerely hope this information helps clarify your situation and supports you in resolving the issue. Please don’t hesitate to reply if you have any updates.

Thank you for your understanding.

If the answer is helpful, please click "Accept Answer" and kindly upvote it. If you have extra questions about this answer, please click "Comment".

Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.

Vergil-V 13,220 Reputation points Microsoft External Staff Moderator

2025-11-11T06:00:45.81+00:00

Hi @Tekeshe, Malconm
I just wanted to kindly follow up to see if you’ve had a chance to review my previous response.
We would greatly appreciate any updates you may be able to provide.
Your feedback is essential to our ongoing efforts to enhance the quality of our support.

Thanks again for your time, and we look forward to hearing from you
Vergil-V 13,220 Reputation points Microsoft External Staff Moderator

2025-11-13T05:57:46.61+00:00

Hi @Tekeshe, Malconm
I hope this message finds you well.
I’m reaching out to follow up, as it’s been a little while since we last touched base regarding the error message “Cannot verify or add the calendar to Outlook”.
If your question or concern has been addressed, please consider marking any helpful responses as “Accepted Answer”. Doing so helps others in the community find useful guidance more easily and keeps the conversation productive for everyone.
Thanks again for your time

Answer 3

AI answer

The error message you are encountering, "Task 'Internet Calendar Subscriptions' reported error (0xEB404005)", typically indicates that Outlook is unable to verify or add the specified Internet calendar link. Here are some steps you can take to resolve this issue:

Check the Calendar Link: Ensure that the URL you are trying to add is correct and valid. You can try opening the link in a web browser to see if it leads to a valid calendar file.
Add the Calendar via OWA: If you are using Outlook 2019, Outlook 2016, or Outlook for Microsoft 365, consider adding the Internet calendar through Outlook Web App (OWA). The server running Exchange Server manages the calendar subscription and updates. This method may help bypass the issue you are experiencing in the desktop application.
Check for Updates: Make sure that your Outlook application is up to date. Sometimes, updating the application can resolve compatibility issues.
Firewall/Antivirus Settings: Check if your firewall or antivirus software is blocking Outlook from accessing the Internet calendar. You may need to configure these settings to allow Outlook to connect.
Repair Outlook: If the issue persists, you can try repairing your Outlook installation. Go to Control Panel > Programs > Programs and Features, select Microsoft Office, and choose the Repair option.

If none of these solutions work, you may want to consult the official Microsoft support documentation or forums for further assistance.

References:

You can't add an Internet calendar in Outlook 2019, Outlook 2016, and Outlook for Microsoft 365

AI-generated content may be incorrect. Read our transparency notes for more information.

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How to fix Task 'Internet Calendar Subscriptions' reported error (0xEB404005)

3 answers

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