I have for decades created a new spare admin capable account. I can't guess what's wrong here but as I do what I do, I've never found this issue.
Background: I enabled the built in admin, added a password, realized I didn't need the built-in enabled, disabled the built-in like it originally was, in hoped of getting the request/grant access screen to stop asking for a password everytime i downloaded or deleted something.
Problem: I can not grant access to anything with out the log in and password (WHICH I HAVE) but there is no space to actually type it all. The dialog that pops up says ""Do you want to allow this app to make changes to your device?
[app name: in this case Windows Command Processor}
to continue, enter an admin username and password.
[NOTE: there is no data box, there is nothing except a button that says NO]"