Provisioning AAD Guest user on GitHub Enterprise

We are using GitHub enterprise for product development. We are using Azure Active Directory(AAD) for authentication. SAML authentication is configured for developers to access the GitHub Enterprise.
We want to onboard partner resources to contribute to our project.
To keep the process light weight we add partner developers as guest users in our Azure Active Directory.
We also added the guest users to the GitHub App registered on the AAD but after couple of days the guest user is still not provisioned on the GitHub.
Is this scenario supported on GitHub Enterprise? If not what is the other way to have partner developers to work ok our project on GitHub Enterprise?