I am having this same issue! 

I have the same problem! I'm not sure if it is because the students are under 13? Because they are under 13 they cannot add me as a coach and I cannot view their progress or make assignments. Very frustrating.

As I'm importing my Google Classroom it tells me no class is found. I've tried it several times over the past school year with no luck.

For anyone who is still experiencing this issue, please report the problem via a support ticket so we can investigate the issue: https://khanacademy.zendesk.com/hc/en-us/requests/new?ticket_form_id=260948