Is it a known issue, that the default page of OneNote notebook is corrupt, when you add/create it as new tab in a channel?
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I did see this as an old issue in Answers - not sure if any of these recommendations could help you: https://answers.microsoft.com/en-us/msoffice/forum/msoffice_onenote-mso_win10-mso_365hp/onenote-sect...
You may also see this conversation which reminds you to check the admin portal to make sure OneNote is checked (thanks @adam deltinger! https://techcommunity.microsoft.com/t5/microsoft-teams/cannot-add-a-onenote-tab-in-teams/m-p/665480
Thank you for your reply!
I don't think the first link is related to the issue I described.
The second link does not apply since we were always able to add and use OneNote.
Today I tried it again and the issue seems to be fixed by now.
I'm not able to reproduce but we did not make any changes regarding Teams/OneNote.