"cannot open git-upload-pack" although Git account in place

Wondering if anyone has a possible solution for an issue we are seeing.

From R-API, a user has successfully established a connection for "Git" in the preferences with their credentials.
When they go to "Test Connection", and enter a valid repository, they receive an error, "cannot open git-upload-pack".

Since they are unable to get a connection to a repository, they cannot pull down updates to the associated project or run specific test steps which requires a Git credential.