Kenneth

Thanks for your quick response! Yes, this still works on exchangelib v4.9.0. Changing the api version string back to "Exchange2019" actually does not fix the error. We still get the...

Hardcoding the version did not solve the problem on the v5.2.1 for us either. I looked into the requests and responses for both v4.9.0 and v5.2.1. As mentioned in the...

Same's for our case, all the GetFolder calls for single folders succeed: ``` GetFolder on folder Aufgaben succeeded GetFolder on folder Conversation Action Settings succeeded GetFolder on folder Dateien succeeded...

for us the expected error came up for the last testing code block you posted @ecederstrand (still on v5.2.1): `ERROR: GetFolder on folder Folder (XrmInsights) failed: Tried versions ('Exchange2016', 'Exchange2015_SP1',...