NEw iPhone Cannot access Facebook

I got the new iPhone 17 pro max and transferred all apps from my 15 pro. But Facebook is not letting melogin. I get a message that says a code was sent to my iPhone 15 (already erased and returned, and to my PC. Not clue where on my PC. Then I do get a code, and it says page unavailable. I cannot even ask Facebook for help.

Any suggestions would be great.