Hi!
I thought I would chime in and let you know our school is having the exact same issue. When I reached out to Microsoft, they admitted that there were multiple reports of this happening
I was able to find a workaround until Microsoft fixes this issue.
- Navigate to a Class Team that is affected by this.
- Select the Assignments tab.
- Create a New Assignment.
- When the new Assignment page appears, select Attach and select Class Notebook.
- Now close out of the assignment.
- Select the Class Notebook tab.
- You should now be prompted to Setup your Class Notebook.
Annoying, but it works for our school.
Others issues that are happening with Teams created via School Data Sync:
When switching Teams, the Teams.Desktop app will shoots errors
The Home tab on multiple Teams fail to generate. Just stuck in a weird SharePoint view