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Frankie380's avatar
Frankie380
Copper Contributor
Mar 24, 2024

Test-OAUthconnectivity against O365 fails

Hi I have run HCW on my on premise exchange server for full hybrid classic type and the communication between exchange online and on premise seems not to be running smoothly.   Here is the result o...
Exchange Server
LeFleiM365's avatar
LeFleiM365
Copper Contributor
Mar 26, 2024

Frankie380 So I had the same issue yesterday and here is how I solved it.

 

So the error has something to do with Accounts access control endpoint. The HCW adds this as an Authentication Server in Exchange OnPrem. 

 

I checked the settings on it and one thing looked off to me. under the domain names, I found my main DomainName added as autod:contoso.com. Everytime I've set up HCW or OAuth manually, I always added the domain without autod:contoso.com. 

 

So I removed the domain using set-AuthServer -identity "ACS*" -DomainName @{Remove="contoso.com"}

 

the added it back again with: set-AuthServer -identity "ACS*" -DomainName @{add="contoso.com"}

 

This caused the autod: prefix to be removed. Did an IISReset, after that Free/Busy started working.

 

Good luck

 

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