iCloud Calendar: Invites are .ics, cannot add invitees

Cannot respond to invites, as Incoming meeting invitations to both email addresses associated with my iCloud Calendar arrive only as .ics attachments. Does anyone know of a solution for me?


My iCloud Calendar itself syncs normally across iPhone, iPad, iCloud.com and Outlook for Windows. Ordinary events save normally.


However, incoming meeting invitations to both email addresses associated with my iCloud Calendar arrive only as .ics attachments and never appear in the iCloud Calendar Inbox, despite both addresses being configured for “In-App Notifications”.


In addition, on iCloud.com I can create and save an ordinary event, but if I add an invitee, iCloud Calendar gives the error: “Changes could not be saved because of a server error.”

iPhone 15 Pro, iOS 26

Posted on Aug 9, 2026 4:45 AM

Reply
Question marked as Top-ranking reply

Posted on Aug 9, 2026 6:11 AM


Your iCloud Calendar database has likely experienced a CalDAV server-side routing corruption or token desynchronization for those specific email alias handles. When iCloud fails to parse inbound invitations natively via in-app notifications, it falls back to raw .ics email attachments, and the server-side error when adding invitees confirms the CalDAV server-side write permissions are blocked. 

Fix the Server Error and Invite Parsing

  • Toggle iCloud Calendars Off/On: On your iOS device or Mac, go to your device settings, tap your profile, select iCloud, tap Show All / Apps Using iCloud, and turn Calendars off. Choose Delete from My [Device] when prompted (don't worry, your data remains safely on Apple's servers), restart the device, and toggle Calendars back on. 


3 replies
Question marked as Top-ranking reply

Aug 9, 2026 6:11 AM in response to akscherer


Your iCloud Calendar database has likely experienced a CalDAV server-side routing corruption or token desynchronization for those specific email alias handles. When iCloud fails to parse inbound invitations natively via in-app notifications, it falls back to raw .ics email attachments, and the server-side error when adding invitees confirms the CalDAV server-side write permissions are blocked. 

Fix the Server Error and Invite Parsing

  • Toggle iCloud Calendars Off/On: On your iOS device or Mac, go to your device settings, tap your profile, select iCloud, tap Show All / Apps Using iCloud, and turn Calendars off. Choose Delete from My [Device] when prompted (don't worry, your data remains safely on Apple's servers), restart the device, and toggle Calendars back on. 


iCloud Calendar: Invites are .ics, cannot add invitees

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