As stated in the last update, the ability to use multiple Teams accounts at the same time is being implemented in stages for Desktop. Faster tenant switching functionality on the Windows client has been rolled out to the public ring fully, and Mac will begin rolling out soon. Work is in progress on cross-tenant notification improvements, and support for multiple accounts on desktop will follow. We’ll keep you posted!
Note: The ability to use multiple Teams accounts at the same time is supported on iOS & Android today.
Alex & the Teams team
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If you are hitting the document library of 20,000 items please try this solution.
It is a known issue for OneNote.
(Let’s try that again with the correct link :) ) https://blogs.msdn.microsoft.com/onenotedev/2016/09/11/onenote-api-calls-fail-with-a-large-number-of-items-in-a-sharepoint-document-library/
If you are experiencing something else, please let me know the error messages you are seeing in the comments below.
-WarrenJohn White commented
Thanks Warren - although to be clear - that's not a solution - it simply avoids the issue. In our case, the >20,000 items in a library is a necessary business requirement, and we can't bring it under.