asUserIdentifier
Casts this UserPolicyGrantPrincipal as a UserIdentifier and retrieves its kotlin.String value. Throws an exception if the UserPolicyGrantPrincipal is not a UserIdentifier.
Casts this UserPolicyGrantPrincipal as a UserIdentifier and retrieves its kotlin.String value. Throws an exception if the UserPolicyGrantPrincipal is not a UserIdentifier.