When signing in to third-party apps using Apple ID I get an “invalid credentials” error (or something similar, depending on which app I use). The app shows up in the “Apps using Apple ID” setting, but I’m unable to log on.
On apps that I’ve previously signed on using Apple ID with a previous iPhone works however.
Hey there Birdman1239,
We understand you're experiencing an issue with using Sign in with Apple, and we'd like to share a resource that may help.
Take a look at it here: How to use Sign in with Apple
Specifically, check out the "Get help with Sign in with Apple" section.