Apple ID password says incorrect when it is correct.

So about once a week or whenever I try to download anything from the App Store, it says my Apple ID is incorrect when I type in the right password. I’ve changed my password 5 times within the past week and it’s honestly just getting annoying! Is there anything I can do to fix this? I’ve signed out of my account already and signed back in and that did not seem to help. I have an iPhone 12 Pro Max. (not sure why that’s not an option)...