Environment: Exchange 2010 on both sides, TMG2010 on my side (not sure about other side)
Exchange Federation is not working - not sure how to troubleshoot. It doesn't work in either direction.
Test-FederationTrust shows all success
Get-FederatedDomainProof shows the proof, which has been created as a TXT file in external DNS
In EMC under Federation Trust, the gateway is configured (showing FYDIBOHF25SPDLT.domain.com) though the status is Unknown
In EMC under Organization Relationship tab, I can't connect via the automatic option (federation information could not be received from the external organization), but setting it manually gives no errors.
autodiscover is working fine according to https://www.testexchangeconnectivity.com/ - I can see the successes in TMG log when I run this tool. However when I get a user in the domain I wish to federate with to get my free/busy via an Outlook Meeting Request, I don't see anything hitting TMG and they don't see my free/busy.
TMG rule is set to Basic Authentication
Where is the next area to troubleshoot?