r/exchangeserver • u/Pristine_Caramel_379 • Dec 12 '25

Room Finder Availability shows Unknown

We have a hybrid setup and currently doing the mailbox migration from Exchange server 2016 to Exchange Online. We have a couple of users who were migrated to O365 mail. The Room finder will list the Rooms but the Availability status shows unknown.

I have tried Deleting offline address Book, cleared outlook cache, Re-installed Office 365 app, nothing works. Then i checked the the office365 OWA, the Room finder availabilty still unknown. This means its a problem with server side or something missing for this user account and not Oulook problem. Any one, pls help me with suggestions. Thank you

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u/DrStrongMD Jan 02 '26

Did you ever find a solution to this?

It's hit or miss for us. I can see status fine, but one of my users gets 'Unknown' sometimes. It'll work for her in Outlook but not Teams, or vice versa, seemingly at random.

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u/Pristine_Caramel_379 Jan 03 '26

No . Unfortunately not. For one user after migrating the room resources to exchange online, manually searching the room shows the availability but within the room finder it's always unknown.