Apple ID changed and unable to make it the new Apple ID
I've been using and watching AppleTV+ for over a year. and now I am unable to access anything. I went to settings and noticed that my Apple ID is my old one that I had to abandon because it was an email I can no longer access. Anyway, my apple ID changed to my new email. But my OLD apple ID keeps coming up on the screen.
I follow the prompts to sign-out, and then resign-in which I do. I have completed this three times using my Macbook pro and my apple phone. Each time it refreshed but then my old Apple ID reappeared, and when trying to access shows, I was denied.
I'm sure this has something to do with the two different Apple IDs. Need diagnose and fix please.
FireTVEdition-InsigniaHD(2018),