If it was me, I'd write the Chromebook off as now being solely for school use. Your child needs to log into it with their school account in order to participate

If it was me, I'd write the Chromebook off as now being solely for school use. Your child needs to log into it with their school account in order to participate and complete their schoolwork, I don't see any way around this. As soon as the school account logs in, I believe the machine is then enrolled as a managed device of your school district. Maybe you could get the school to supply you with a Chromebook, if you really want one. Where I live this is how it works (the school supplies the Chromebook).