Apple ID is a pain
I have five apple devices and there is always one that will force me to change my Apple ID password. My iPad is the culprit now. It will not allow me to put the new Apple ID into it. I changed my id several weeks ago because my Mac mini didn't accept the ID. I have all but my iPad signed in now. Here is my issue with Apple ID's, as we get older, I'm 75, having to remember passwords is a problem. Apple is the ONLY company that forces you to remember a password. I don't have problems with Google, Proton Mail, or any other company, only Apple. Writing down ID's and having them lie around defeats the purpose of having security on a device.
Even getting on this website, when I placed my Apple ID into the sign in page it would not recognize it. When I clicked cancel, the page underneath the sign-in pop up, allowed my credentials. I signed into Apple on my phone using my new credentials, no problem. I signed into apple on my MBA, no problem. While Apple may think they have the most secure system in the whole world, it is the most frustrating to us old folks.