Unable to add a Re-active domain in cloudflare

Please help us to how i add a Ernet india domain () after re-active ( renewal after dormant stage) in ernet india site i update the NS record but till not able to add it on cloudflare. it generate error ““rccollege.ac.in is not a registered domain””
but domain is in active status.
Please help us.

I can see that rccollege.ac.in is a unsupported TLD

So from where have, you bought the domain?
and pls share a screenshot of the nameservers of your domain.