Calender not sync on hybird exchange

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New Contributor
Calender not sync when try to schdule meeting from on premise to cloud or from cloud to on premise on hybird exchange and getting this error ( unable to schedule event - mailbox not found )
While all configuration for hybrid done , OAuth + federation trust enable to enable free/busy + organization relationship enabled also

Can you help for this please !
2 Replies
Is this a new setup or did it break recently
Yes it’s a new setup