Unable to get token with universal login

Issue:
When attempting to acquire a token using POST oauth/token after successful sign-in via Universal Login in a mobile app, an error occurs.

Request for Assistance:
Please provide guidance on resolving this token acquisition error.

Verified:

  • Successful redirection from the application to Universal Login using /authorize
  • Successful sign-in with email and password on Universal Login
  • Retrieval of a redirect URL containing the code