I am having the same issue. In the ribbon that contains "Lesson Hook", "Exit Ticket", "Lesson Plan" and "More Tools", there is no longer the blue assign button. I have gone to various practice page...

1. Közösség
2. Classroom Product Questions and Feedback
3. Not Able To Assign Courses

Same question. I would like to export to Google Classroom. It looks like my students are not exporting to Google classroom. 

1. Közösség
2. Classroom Tips and Tricks
3. Export Scores to Google Class