Allow for read only access in OneNote
If a user has read only access, Teams does not allow them to use the OneNote at all. Please allow the OneNote to be used by those with read only access.
By default, the OneNote should open as read only and if someone wants to edit the OneNote, they should be prompted to open the OneNote in edit mode (if they have access).
Mark Bewley commented
A temporary change was made during covid-19 to make OneNote read-only, but this seems to have stopped.
A more permanent option to make a selected notebook read-only would be ideal.
As we have embraced Teams, we have moved a number of "guides" to make things easier to find.
Having these default to editable means anyone can accidentally change them.
I can understand, some notebooks should be collaboratively editable directly in Teams.