1. Go to your Account Settings under your profile name.
2. Proceed to Google and refresh the connection.
Please select Remove integration and restart the connection by clicking Use Google Classroom
3. Click on your Google Classroom email account, and allow Quizalize access.
Please refresh your page, and then return to assign a new activity. The ability share with Google Classroom should return.
If you continue to have issues with Google Classroom, please contact us at email@example.com.