Freebusy not working from On-Premise to O365 Hybrid for Multi Geo users outside the home tenant Geo

Occasional Visitor

We recently started seeing an issue where on-premise users from an Exchange 2013 (CU23) environment are no longer seeing freebusy information for some migrated users in O365. We have multi-geo, and there seems to be a pattern where it's working for users in the home GEO of the tenant (NAM) but not for users outside that, such as GBR, EUR, JPN etc. We have a call open with MS, but so far (2 weeks later) still no further in finding the cause or solution. Anyone else come across this?

1 Reply
Really strange... Please, try to run this cmdlt from one of your on-prem Exchange Servers and check the behavior after 30 minutes +/-

Set-AuthServer ACS -RefreshAuthMetadata

Best Regards