Organizing, editing, and coordinating meetings and events within Microsoft Teams calendars
For Teams/Outlook meeting invitations and updates that are added to the calendar but no email is seen, the most common causes are spam/junk handling, rules, or filtering in the mailbox.
Work through these checks in Outlook/Outlook on the web:
- Check Junk/Spam and "Other" inbox
- In Outlook.com/Outlook on the web, check the Junk Email folder and move any valid meeting invitations back to Inbox using Mark as not junk.
- Also check the Other tab (if Focused Inbox is enabled) and any custom folders where rules might move messages.
- Check blocked senders
- In Outlook.com or Outlook on the web:
- Sign in to the mailbox.
- Select Settings > Options or Mail.
- In the left menu, select Blocked Senders or Block and allow.
- If organizers’ addresses or their domains (for example,
@contoso.com) appear there, remove them from the blocked list.
- In Outlook desktop (for Microsoft 365/Outlook 2016):
- On the Home tab, select Junk > Junk Email Options.
- Open the Blocked Senders tab and remove any legitimate organizers or domains.
- In Outlook.com or Outlook on the web:
- Check rules and forwarding
- In Outlook.com/Outlook on the web, review Rules and Forwarding settings to ensure meeting invitations are not being:
- Automatically moved to another folder (including RSS or archive folders).
- Forwarded to another mailbox and deleted.
- In Outlook desktop, review File > Manage Rules & Alerts for any rules that might move or delete meeting-related mail.
- In Outlook.com/Outlook on the web, review Rules and Forwarding settings to ensure meeting invitations are not being:
- If this is about Teams webinars specifically
- Webinar invitations are sent via the Dynamics 365 email delivery service and can be quarantined by tenant spam filters.
- An admin should:
- Go to Microsoft 365 Defender → Anti-spam policies.
- Edit Connection filter policy (Default).
- Under Always allow messages from the following IP addresses or address range, add the IP ranges used by the Dynamics email delivery service as documented in the public IP list.
- Save and, if prompted, enable organization customization (or run
Enable-OrganizationCustomizationin Exchange Online PowerShell, then retry adding the IPs).
- If meeting responses/updates are missing from Inbox
- For some Outlook desktop scenarios, the receive-folder mapping for meeting items can be wrong. Admins can use MFCMAPI to verify that the Receive Folder Table contains an entry for
IPM.SCHEDULE.MEETINGpointing to the correct folder, following the documented procedure. This should only be done by someone comfortable with advanced mailbox tools, as incorrect changes can damage the mailbox.
- For some Outlook desktop scenarios, the receive-folder mapping for meeting items can be wrong. Admins can use MFCMAPI to verify that the Receive Folder Table contains an entry for
If, after these checks, invitations still do not appear anywhere in the mailbox, the organizer should be asked to confirm any non-delivery reports and, if using Outlook.com, follow the sender guidance in the Outlook.com sender support article.
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