Here is a list of things to try if you’re having difficulty accessing your Microsoft Classroom:

1. Ensure that you’re logged in with the same credentials as your school’s Teams app.
2. Verify that your school's version of Office 365 is up to date.
3. Open your browser in Incognito or Private mode and relog into your Office 365 account.
4. Clear cache, cookies and browsing history from your browser settings.
5. Try another web browser or mobile app if possible.
6. See if any updates need to be made to Books app in your device settings.
7. Make sure your device has the right settings for Office 365.