Unable to promote from a Heartcore dev to live due to [DeploymentUpdateSiteExtensionGitPullFailed]

[KholofeloMoyaba]

Issue description

I have an issue on Umbraco Heartcore where I'm unable to deploy changes to live (i.e. migrate schemas from the development project to the live project).

See below the error I'm seeing (DeploymentUpdateSiteExtensionGitPullFailed):

There doesn't seem to be an intuitive way to resolve this. I'm also unable to access Kudu to get more details.

From what I see this should be as simple as doing a force pull from dev into live, or a git checkout of local changes on the live project. I, however, cannot seem to have any access that can allow me this level of control.

What is the procedure for handling such an error?

PS: I have contacted the support channel, but that is taking a long time - it's been over half a day waiting for a response and this is stopping us from a doing major deployment.