Issue with SAML and G Suite

I want to deploy an instance of Gitlab for my team and would like to use G Suite as the sole identity provider. I have deployed Gitlab CE on a DO droplet, and updated the software to the latest version available on the repository (10.4.2 at this time).

I have successfully set up a new SAML app for Google and followed the [OmniAuth SAML guide] to perform the integration.

I have got the following settings in my gitlab.rb:

gitlab_rails['omniauth_enabled'] = true
gitlab_rails['omniauth_allow_single_sign_on'] = ['saml']
gitlab_rails['omniauth_block_auto_created_users'] = false
gitlab_rails['omniauth_providers'] = [
    name: 'saml',
    args: {
      assertion_consumer_service_url: '',
      idp_cert_fingerprint: 'MY_IDP_CERT_FINGERPRINT',
      idp_sso_target_url: 'MY_IDP_SSO_TARGET_URL',
      issuer: '',
      name_identifier_format: 'urn:oasis:names:tc:SAML:2.0:nameid-format:persistent'
    label: 'Company Login'

With this, I have got a field in my Gitlab sign-in page which successfully directs me to a Google SSO page where I can put my credentials. However, the sign-in fails to complete with a 422 and the following error in the logs:

(SAML) Error saving user MY_USER@MY_DOMAIN (): ["Email can't be blank", "Email domain is not authorized for sign-up", "Notification email can't be blank", "Notification email is invalid"]

No idea how to move on from this. I have looked online for assistance on Gitlab + G Suite integration but failed to find further information than what’s in the documentation. Can someone help with this please?

I am struggling with the same issue: did you find any solution for the error
[“Email can’t be blank”, “Notification email can’t be blank”]