To add a repository to a team or update the team's permission on a repository, the authenticated user must have admin access to the repository, and must be able to see the team. The repository must be owned by the organization, or a direct fork of a repository owned by the organization. You will get a 422 Unprocessable Entity status if you attempt to add a repository to a team that is not owned by the organization. Note that, if you choose not to pass any parameters, you'll need to set Content-Length to zero when calling out to this endpoint. For more information, see "HTTP verbs."

Note: You can also specify a team by org_id and team_id using the route PUT /organizations/{org_id}/team/{team_id}/repos/{owner}/{repo}.

For more information about the permission levels, see "Repository permission levels for an organization".
Add or update team repository permissions