Some time back I got few tickets where users were complaining about free/busy not working between on perm exchange and office365, my issue was resolved after following below mentioned action plan, the issue was with delegation Trust and Token Validation after I refresh Federation Trust metadata issue Stand Resolved.
In order to test this: Run the below command on On-Premise Exchange Powershell
In order to test this: Run the below command on On-Premise Exchange Powershell
Test-FederationTrust -UserIdentity Admin@letsexchange.in
Type : Error
Message : The federation trust doesn't contain the same certificates published by the security token service in its federation metadata.
Id : TokenValidation
Type : Error
Message : Failed to validate delegation token.
To fixed the Error I ran the below Command.
Get-FederationTrust | Set-FederationTrust –RefreshMetadata
This will refresh the Trust metadata and the free/busy issue will be resolved for you.
Re run the below command to cross check if the error are gone now
Test-FederationTrust -UserIdentity Admin@letsexchange.in
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