question: external team

Is there a way to add an external team as a repo collaborator?

Hi there! :wave: Welcome to the Community!

Unfortunately this is not possible - you’d need to invite each individual as an outside collaborator:

https://help.github.com/en/github/setting-up-and-managing-organizations-and-teams/adding-outside-collaborators-to-repositories-in-your-organization

Organization permissions and team admin is something we’re working on a lot at the moment, though, so perhaps you’d like to submit a feature request through our official product feedback form so that our product team can see exactly how you’d like cross-organization invites in GitHub to work?