Cloudflare domain setup issue

Hello, I encountered an error message when trying to add a new website (Refer to https://cfl.re/3VUQyyL for assistance. The zone you are trying to upgrade is marked as Do Not Upgrade. (Code: 1315)), which prevented the website from being added. I have confirmed that there are no issues with the billing and payment methods. Please help resolve the above issue and assist in adding the website. Thank you!

Many thanks!

Hi @brett30,

Can you provide the domain name you are adding to your account?

Thank you.

This domain has been setup in Cloudflare for at least 2 years.

http://fife-boilercompany.co.uk/

There was a billing issue which I fixed. ( April 24).

This domain hasn’t worked since.

It looks like the nameservers changed a few days ago, what that intentional? https://securitytrails.com/domain/fife-boilercompany.co.uk/history/ns