Hi @butlercathal,
Both of these relate to Deprecated - Can't set nameservers - (Inconsistent Set of NS / Nameserver not authoritative) and generally on;y cause an issue if you are trying to change from one pair of Cloudflare nameservers to another (i.e. when you move a domain from one account to the other).
If that is the case in your situation, you will need to follow support’s instrutions and rely to them for help. If not, I am also not sure what your registrar’s issue is and their replies that you have posted don’t really clarify the situation.