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TEST-OAuthConnectivity | The remote server returned an error: (403) Forbidden
Hello Exchange Tech Community, I have setup a lab environment of Exchange Server 2016 in Hybrid Configuration. I can successfully onboard and offboard mailboxes. OnPrem Exchange Server is I...
I had the exact same problem, implementing this fixed it for me.
https://learn.microsoft.com/en-us/exchange/hybrid-deployment/deploy-dedicated-hybrid-app#prerequisites