gt auth --token <your_cli_auth_token>command shown (your CLI auth token will be pre-filled)
gt stack submitto create or update pull requests in GitHub for every branch in your stack.
gt stack submit:
gt stack submit, you can add a GitHub Personal Access Token (these are intended to give command line tools limited access to work with your account) - just follow these instructions to enable access:
gt authagain), and
gt stack submitshould work correctly.