Can't receive Calendar invitation and response

Question

I can't receive calendar invitation and response lately, I use hotmail on M365 Outlook. Please advise. Thank you.

Answer 1

Hi Lhil,

Are you using New Outlook or Outlook 365?

Have you checked Junk folder?

• Look in your Junk, Deleted Items, or other folders.
• Go to Settings → Rules and check if any rule is moving or deleting calendar invites.

If you are using 365,

• Go to File → Account Settings → Delegate Access
• Confirm no delegate is intercepting your calendar invites
• If a delegate exists, check if invitations are set to go to you and not only the delegate

I’m eager to hear back and work together to find a solution.

Answer 2

Try the following checks and fixes for a Hotmail/Outlook.com account used in Outlook on Windows when calendar invitations and responses are not arriving:

1. Verify the account is working and not blocked

• Sign in directly to Outlook.com in a browser and confirm:
  • Sign-in works.
  • The mailbox is not blocked and can send/receive normal email.
• If sign-in fails or the account is blocked, use the Microsoft account sign-in helper and unblock flow referenced in the Outlook.com mail troubleshooting article.

2. Check mailbox and cloud storage

• If Microsoft cloud storage is full, new mail (including calendar invitations and responses) will be rejected and bounced.
• In Outlook.com, check mailbox storage using the storage link and free up space if needed (delete large mail, empty Deleted Items and Junk Email).

3. Check Junk/Blocked senders and rules

• In Outlook.com / Outlook on the web:
  1. Sign in to Outlook.com.
  2. Go to Settings > Options or Mail.
  3. Open Blocked Senders or Block and allow and remove any legitimate senders or domains that might be sending invitations.
• In Outlook desktop:
  1. On the Home tab, select Junk > Junk Email Options.
  2. On Blocked Senders, remove any legitimate addresses or domains.
• Also review any inbox rules that could be moving or deleting meeting messages (for example, rules diverting mail to RSS or other folders) and disable or adjust them.

4. Check forwarding settings

• If forwarding is configured on the Outlook.com account, verify whether the option to keep a copy of forwarded emails is enabled. If it is disabled, messages (including invitations) may be forwarded elsewhere and not kept in the Hotmail/Outlook.com mailbox.
• Re‑enable keeping a copy if invitations should remain visible in Outlook.

5. Check device sync

• If the issue appears only in Outlook on Windows but invitations show up in Outlook.com web:
  • Remove and re-add the account profile in the Outlook app, or
  • Remove the device partnership from the mailbox as described in the Outlook.com sync guidance, then reconfigure the account so it resyncs cleanly.

6. Ask senders to confirm delivery

• If specific senders’ invitations are missing, ask them to confirm whether they receive any non-delivery reports (NDRs) and to verify that their messages are not being blocked or filtered on their side.

If, after these checks, invitations and responses still do not appear anywhere in Outlook.com (Inbox, Junk, other folders), contact Microsoft support for Outlook.com with details of affected senders and approximate times so delivery traces can be reviewed.

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References:

• Can't send or receive email in Outlook.com
• Where are my email messages or calendar events in Mail and Calendar for Windows 10?
• I haven't received any email in Outlook for several months - Microsoft Q&A
• Stopped receiving emails on my account. - Microsoft Q&A