Unable to send new calendar events in Outlook.

Dear @ANIS BINTI MOHAMAD HAMZAH,

Thank you for posting your question in the Microsoft Q&A forum.

Based on your description, it sounds like you cannot send your calendar event and it keeps pop up "something went wrong". For better understand your situation, could you please provide us more details information as:

• Which version of outlook are you using? (New Outlook or Classic Outlook)
• Does it occur with other users at your organization or just only with you?
• Are you creating the event in Outlook on the web/new Outlook or in classic Outlook for Windows (desktop)?

In the meantime, here are some suggestions you can try:

Check License/Mailbox validity

If your sign‑in has no Exchange Online license, there’s no mailbox and calendar writes fail. An admin can verify the user has a valid Exchange Online license assigned and the mailbox is healthy.

Try a minimal event

• Remove attachments (especially large files).
• Turn off Teams meeting toggle temporarily.
• Invite just yourself (no other attendees).
• Set a simple subject/location; avoid emojis/special characters. If a minimal event works, add elements back one by one to find the cause.

If you are using New Outlook (web version)

Browser/session reset

• Open a new InPrivate/Incognito window and retry.
• Clear cookies/site data for outlook.office.com and office.com.
• If you use ad‑blockers/script filters/VPN, disable them briefly.

Check the calendar target

• Confirm you’re adding the event to your primary Exchange calendar, not a SharePoint/Group calendar with sync issues (those can display but fail to write).
• If it’s a shared or room calendar, re‑add the calendar and test.

If you are using Classic Outlook

Work Offline > Online

• In Outlook, File > Work Offline (toggle on), wait 15s, then toggle off.
• Restart Outlook.

Profile repair

• File > Account Settings > Account Settings > select the account > Repair.
• If issues persist, create a new Outlook profile (Control Panel > Mail > Show Profiles > Add).

Add‑in isolation

• Start Outlook in Safe Mode (outlook.exe /safe), then try creating the event.
• If it works, disable suspect add‑ins (Teams Meeting, third‑party calendar tools) one by one.

we're looking forward to your update so we could support you more effective.

Hope information above helpful, if you have any other question, please feel free to reach out.

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