[[It's not 100% clear but it seems that the problem only occurs if you put the screen protector on before recording your fingerprint. If you record the fingerprint and then add the protector it does not allow you to unlock the phone as it sees a vastly different print.

In other words, a screen protector is not a "master key" for any S10!

Please correct me if I am wrong.]]

Edit: On second reading of the article it looks like a screen protector might actually be a master key for any S10 phone. That's a really big design flaw! (Thanks to computerex for making me read the article more critically.)