PIN required every login

I have two users who must enter their PIN number every time they log in. I noticed in another thread that sign in with Google account eliminates this, but those users don’t have a Google account. Also, the thread mentioned that some browsers delete history (like cookies) but I’m not sure how to enable/disable this on iPhone. Any suggestions? Thanks!

They should not log out to avoid this. Just shut down the app

Assuming they’re using Safari, can you check with them that they’re automatically clearing cache/cookies when the browser is closed?