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How to fix Shared Calendar not visible upon accepting the invitation

Estrada Joaquin 20 Reputation points
2026-05-06T12:27:38.1133333+00:00

Hello,

within my organization we're using a shared calendar, I've been added to one and even though I've accepted it multiple times - and got removed and readded to it - it does not show up in my calendar list and I get an error notification.

I've also tried troubleshooting with Account Settings and "shared calendar improvements", yet the problem is not solved.

Is there anything else I should try before restarting the whole process again?

Thank you

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Outlook | Windows | Classic Outlook for Windows | For business
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Answer accepted by question author

Jayden-P 22,825 Reputation points Microsoft External Staff Moderator
2026-05-06T13:30:36.17+00:00

[Solution updated 05/07/2026]

Summary: OP is trying to add a secondary calendar of another user. The org-wide disclaimer was enabled and the Accept button is not visible.

Solution: Temporarily disable org-wide disclaimer.

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 @Estrada Joaquin

I have tested and I do see the same behavior as yours.

May I ask in your Outlook profile, how many accounts are there?

If you have more than one account, go to File > Account Settings > Set the account receive the calendar as default.

Next, close Classic Outlook and go to Outlook web via https://outlook.cloud.microsoft/mail/.

Go to Calendar > Add calendar > Add from directory > Choose your account > Enter the name who shared the calendar with you > add to My calendars.

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After that, wait check if you can see the shared calendar appear on the list in the left side.

If it appears, go to Outlook Classic > Send/Receive tab > Choose Update folder. Verify if you can see the calendar in your Classic Outlook now.

Please try and let me know if it works for you. I look forward for your reply.

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  1. AI answer

    2026-05-06T12:28:28.8266667+00:00

    The error shown in the screenshot indicates a problem connecting to the shared calendar from the invitation message in Outlook for Windows. For this scenario, the documented workaround is to accept the shared calendar invitation using Outlook on the web or Outlook mobile instead of the desktop client, and if the invitation was already accepted in Outlook for Windows, the owner must resend it.

    Follow these steps:

    1. Ask the calendar owner to remove your permissions from the shared calendar.
    2. The owner then sends a new sharing invitation for the calendar.
    3. Do not accept this new invitation in Outlook for Windows.
    4. Instead, open the invitation in one of these clients and select Accept there:
      • Outlook on the web (browser)
      • Outlook for iOS
      • Outlook for Android
    5. After accepting in one of those clients, the shared calendar should appear in the calendar list and then sync to Outlook for Windows.

    If the issue persists or you see HTTP/connection errors repeatedly when accepting, contact your organization’s support or Microsoft Support for further investigation.

    References:

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

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