Problems with teams?

I need urgent help.

Due to the corona situation, I'm homeschooling. In any case, teams doesn't work on my cell phone. The email of my school was changed and then changed back again. In any case, whenever I want to register with the new email, I check my account to see if the email is correct. But he does not accept the new email. I need help, what should I do.

I've uninstalled teams on and it works on my laptop.

Contact the school, your admin should take care of it, there's probably something wrong with the login data and there's little you can do.