Unraid version: 7.0.1
After multiple attempts at installing Kasm and playing around with the previous password resets, I finally succeeded with the following:
Install the Kasm Docker App with the passwords for Admin and User set to 'password'.
As crazy as it sounds I was able to login without issue to the Admin and User accounts.
Change the password to something more secure.
Kasm insists on 1 uppercase, 1 lowercase, 1 number and 1 symbol.
I don't believe I did anything else different on this attempt but it seems to be running fine now.