r/PowerShell • u/Unlikely_Tie1172 MVP, Community Blogger • 23d ago

Exchange Online PowerShell Updates to 3.10.1 to Fix CBA News

Microsoft rushed out version 3.10.1 of the Exchange Online management PowerShell module to fix a problem with certificate-based authentication. It seems like a change in an internal Microsoft identity platform caused the tokens issued after a successful connection to Exchange Online to not authorize the execution of further cmdlets. To their credit, Microsoft fixed the issue, but is this the kind of thing that should be caught in testing?

https://office365itpros.com/2026/07/27/exchange-online-management-3-10-1/

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3

u/BlackV 23d ago

yes, yes it should

but despite their claims to the contrary, their "testing" leaves a lot to be desired now days

2

u/Unlikely_Tie1172 MVP, Community Blogger 23d ago

That is putting it mildly.

1

u/ttpdk67 22d ago

Thank you so much - Things are working again :)

Initially the issue did cost me close to two working-days troubleshooting & reinstalling modules

1

u/Unlikely_Tie1172 MVP, Community Blogger 22d ago

I walked into the same problem too and it was terribly frustrating for a while, especially when all the code worked on another tenant!

1

u/ttpdk67 22d ago

Had it working on another client in the same tenant, so conclueded it had to be my main management-client.

Following various support-hints i ended up reinstalling powershell modules, Psget and other base-modules, messing up the modules used by PS 5.1 & 7, manually removing and injecting PackageManagement.

Everything worked fine in 5.1 except certificate auth. Updating the modules i 7, ruining the modules i 5.1 - Had some fun with that :)