GitHub Actions: Publish to GitHub Packages - access denied?

Hi there, I am currently going through GitHub Actions: Publish to GitHub Packages, my repo is at: https://github.com/nathannj/github-actions-for-packages

After creating a dockerfile and commiting the workflow is running into an error during the dokcer image build with the error:
denied: The “nathannj” account is disabled and can’t accept package uploads.

I may be missing something and am continuing to look around to see but i’m at a bit of a loss, any ideas?