Cannot use private unity packages

I have a project which references a private package in Unity. Unity automatically pull packages when building and I believe it is failing because it does not have access to the git credentials helper https://teamcity-support.jetbrains.com/hc/en-us/community/posts/206813515-How-to-use-Git-credential-helper-to-access-private-repository . Is this expected and is there a way around it?

Thanks

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