Unable to get through the Hybrid Configuration Wizard in Modern mode. This is necessary because we want to migrate mailboxes. Classic mode works.
It knows that there is a Hybrid Agent, but I can't successfully install with either path of using existing or adding a new one. In Azure there is an App Proxy registration which appears to have the incorrect IP for the route to on-prem. This was due to a misconfiguration of our outgoing firewall. However after the firewall configuration was fixed, the App Proxy still has the old return IP, and there is no way in Azure to remove this record.
I've removed the app proxy components on the server, and let the HCW install again but this record is not updated or removed. Also have gone through 'Classic' path which according to community posts is supposed to remove the App Proxy record, but it doesn't.
According to what I've read, if the record is inactive for 10 days, it will be removed, but I'd rather resolve this without waiting for 10 days.
I've tried patching the record using Graph but it doesn't work.
2022.01.31 22:09:59.707 10333 [Client=UX, fn=SendAsync, Thread=15] FINISH Time=2170.2ms Results=BadRequest {"error":{"code":"InternalUrl_Duplicate","message":"Internal url 'https://LOCALFQDNSERVER/' is invalid since it is already in use","innerError":{"date":"2022-01-31T22:09:58","request-id":"d5c4dfe0-096d-4382-9da0-9559f45e0217","client-request-id":"d5c4dfe0-096d-4382-9da0-9559f45e0217"}}}
