I understand you. I switched mail client for security reason. I received spam mail with my email address and phone number - they wanted bitcoins for no uploades AI videos with me and pornvideo. They send BTC address. I looked into mempool.space and mempool doesn't find these address XD. This was input, that my old gmail is corupted and no safety at all. I am changing all my internet identity today. New mail, appleID, all passwords, new SIM card. As a bonus is that I was prepare for leave some social media - facebook, instagram, but I was not do it - and now I will only sending new contact on me few people and finally delete these cancer app.

I joined school mail without problems in proton app. Maybe try it again