To fix the authentication issue with Unreal Tool Box, we made the following change:
In your App Registrations, go to Authentication, click Add a platform, and choose Mobile and desktop applications. Then add the necessary callback URLs.
To resolve the Bad authentication credentials. Check or refresh token. issue with ./RunUAT.bat, we added the option "jwtExpiryTimeHours": "8760", in the server.json file
(Token generated from /api/v1/admin/token)