https://www.dhs.gov/archive/real-id-public-faqs
For example, DACA recipients, temporary protected status refugees, and citizens of states in free association with the USA (Micronesia/Marshall Islands/Palau) that are in the USA are all eligible for Real ID.
"...based on HSI Special Agent training and experience, REAL ID can be unreliable to confirm U.S. citizenship."
https://storage.courtlistener.com/recap/gov.uscourts.alsd.76...