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Hi @w raspe
Could you provide detailed error log? you could check to see if you missed any prerequisites for Microsoft Hybrid Agent.
Also have you checked these two threads and referred to the methods there?
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1.HybridManagement.psm Test-HybridConnectivity -O365 Endpoints = Ok
2.Enabled TLS 1.2 for .net 2 + 4
3.MRSProxy Enabled $false + $true + Basic Auth true + iis Reset
4.Restart-WebAppPool MSExchangeServicesAppPool
5.Reinstalled Exchange Server
6.Renewed Exchange certificates
Regards
Shaofan
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