Hey @balthazaurus-gmailco. I’m glad you found the solution!
Git metadata is used to determine who made the commit and whether they are allowed to deploy your Vercel project. If the git config had the wrong email, then it would make the system think someone other than yourself was trying to create a new deployment. That’s why you got a notification about that other GitHub account needing to be authorized.
If you want to know more about automatic Git deployments with Vercel, this page has additional info: