You can cancel the prompt and continue in the app as normal. It's a sketchy prompt to be sure, but it's easily ignored. My uneducated guess is a keychain promp

You can cancel the prompt and continue in the app as normal. It's a sketchy prompt to be sure, but it's easily ignored. My uneducated guess is a keychain prompt, since I'm signed in with my apple ID via OAuth2 (with the email hidden, etc).