To clarify: in a number of states a Real ID doesn't include a citizenship indicator, and a Real ID in those states is not sufficient identification for voting purposes.
For the majority of existing Real IDs, they will not be valid proof of eligibility to vote.[1]
> While your REAL ID would count as a photo ID when voting, in only a few states would it be considered proof of citizenship. Only five states — Michigan, Minnesota, New York, Vermont and Washington — offer the type of enhanced REAL IDs that explicitly indicate U.S. citizenship.
> Outside of those states, you would need another document to prove you were born in the U.S.
[1] https://thehill.com/homenews/nexstar_media_wire/5787733-woul...