So I have it working now - but until I merged the template in the “default branch” of the main fork, the template was not working. As soon as I did that, even when the PR was not to that branch, the template would show up. Anything i might have done wrong?
I believe this is working correctly. In Creating a Pull Request template for your repository, it says:
Templates are available to collaborators when they are merged into the repository’s default branch.