Outlook published calendar ICS feed stopped including ATTENDEE properties

Question

Expected:

Published calendar ICS feed contains ATTENDEE entries as it did previously.

Actual:

ICS feed generated from the same Outlook calendar URL no longer contains ATTENDEE or ORGANIZER properties.

Regression timeframe:

Working approximately 1-2 months ago, currently missing.

Answer 1

Hi Darko Lesendric,

Welcome to Microsoft Q&A forum. 

To help narrow this down, could you please confirm the following details?

• Are you using a personal Outlook.com account or a Microsoft 365 work/school account?
• Was the ICS link generated from Outlook on the web under Settings > Calendar > Shared calendars > Publish a calendar?
• What permission/detail level did you select when publishing the calendar?
• Does this happen for all calendar events, or only newly created/updated meetings?
• If you create a new test meeting with an attendee and generate a new published ICS link, are the ATTENDEE and ORGANIZER properties still missing?

Also, if possible, please share a screenshot showing the publish calendar settings and the missing properties through private message only.

Once I have these details, I can better determine whether this is related to the calendar publishing settings, the account type, or a possible change in how Outlook currently generates published ICS feeds.

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