“that wouldn’t find the session at all” - very unlikely, did you make sure to enter the 2 groups of numbers with a space (blank) in between exactly as provided? What do error messages say in either case?
It is indeed strange that the green light doesn’t show, but it should show error messages if login fails.
There are two types of messages reg. version, one is mandatory, one explicitly states version related problems. So pls. let us know the exact wording of messages, only then can we narrow the problem.