Invalid Domain Error on my Website when added to CloudFlare

My website is up and running on the internet, still it shows an Invalid Domain Error while adding a site on CloudFlare.

Please kindly suggest or give technical guidance.

I see there are some wrong Cloudflare nameservers added to your domain at your domain registar:

ANSWER 3599 IN NS 3599 IN NS

I also got the same error while trying to add it:

Screenshot 2021-07-01 at 16-14-14 Account Cloudflare - Web Performance Security

As far as I checked, is not a valid TLD based on the public suffix list:

I am afraid you won’t be able to add a domain with that suffix to your Cloudflare account.

May I ask have you tried writing a ticket and contacting Cloudflare support due to your account and/or domain issue?

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