LMS settings - "401: unauthorized"

just installed the LMS add-on version 8.3.1.58. In the browser (Https) all seems to work fine. I can get to the settings and help screens. In the companion app however, I get the error: “401: unauthorised” when I try to access help or settings.

Version: 2023.12.1
Supervisor 2023.12.0
Operating System 11.2
Frontend 20231208.2

Any help is very much appreciated.