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Immutable. The resource name of the entity under which this Group resides in the Cloud Identity resource hierarchy. Must be of the form identitysources/{identity_source} for external identity-mapped groups or customers/{customer_id} for Google Groups. The customer_id must begin with "C" (for example, 'C046psxkn'). Find your customer ID. (https://support.google.com/cloudidentity/answer/10070793)