Change default Facebook account for iPhone/iPad
This is more like an answer to the question. Seen I’ve seen the same question over all of the forum here with no help at all. I found the answer in another forum that worked 100%
”It’s because you are signed in on Facebook in Safari browser. iPhone/iPad first looks for Facebook login in safari before looking for it in the Facebook app.
Log out of Facebook in Safari browser. The game will then use your Facebook app to determine which account to use for login”
iPad Pro, iPadOS 16