AWS Multi Region Replication Keyspaces Alter Table Support?

Now that AWS offers MRR for Keyspaces, is a CQL Alter Table supported? From what I can tell it is not supported since I get this error:

InvalidRequest: Error from server: code=2200 [Invalid query] message="Alter Type Add is not supported on multi region keyspace/table"

but I was not sure if I was doing something wrong. Thanks!