This "issue" is something that can be explained. Apple has introduced a security feature that has been in place since iOS 12 that disables the password field on their devices when they are sharing their screen.
You are in a live test and you would like to sign into an Apple ID. You enter the email but the password field has no keyboard and no input when you enter any keys.
Here is that Apple ID login form where I have actually entered text for the password field. Please note that despite not being able to see the text, the field is actually still receiving the key and will work as expected.