Is it possible to connect to private GIT repositories?
If a private Git repository is used, the authentication must be established with an SSH key generated by Plesk.
In this case, when adding a new repository, specify the URL of the remote repository in the SSH format under Plesk > Domains > example.com > Git > Remote Git hosting like GitHub or BitBucket > Remote Git repository.
The SSH public key field will appear and display the SSH public key automatically generated by Plesk.
Before clicking OK on this screen, add the SSH key to the settings of the remote Git repository.