Hello,
i'm planning to do a Hybrid Migration from Exchange 2010 SP3 CU 28 on-premise to Exchange Online with Hybrid Configuration Wizard. Everything is allright with the wizard until i am on the federation trust page. There i get an error that it is unable to validate the domain from public dns. The log shows me that the Wizard gets a wrong TXT Record when it is asking for the domain. But a nslookup -q=txt domain.com shows the correct txt record. I removed the federation trust from Exchange Server manually after 1 day and created a new one manually and now the log is showing the old federation trust key in TXT Record since a few days... it is still not updating. As i said, a nslookup -q=txt is still correct.
I think maybe the Exchange Server is trying to use a dns federation trust cache to resolve the txt record (because i saw a workaround for Exchange 2016 to create an .ini File which says something like "delete federationtrustcache", but it is not working with Exchange 2010) ? Am i able to delete this cache (if its existing)?
Regards,
ctight