Unauthorized error with git tfs list-remote-branches

I have a repo in Azure Devops that uses TFVC for version control, and I'm trying to migrate it to a new repo that uses git. I'm following the steps in this video. https://youtu.be/7qiQ6ONkSf4 Migrating your TFVC repository to Git. When I get to the point where I need to run git tfs list, I'll let you know. -remote-branches https://dev.azure.com/{my_repo}I get a prompt to sign into Azure Devops, but when I return to PowerShell, I get the following error: TF30063: You do not have permission to access https://dev.azure.com/{my_repo}. The remote server returned the following error code: (401) Unauthorized.