Cannot Add New Custom Domain

Website URL

InfinityFree

Free Website Hosting

Completely free website hosting with PHP, MySQL and no ads on your site!

Error Message

The site is offering to allow me to add my custom domain after CNAME validation method, but when I click the button it just gives a nameserver error and does not add the domain properly.

Other Information

My DNS records ARE correct, I promise(I work in IT, lol)

Custom nameservers on CloudFlare are not an option - not because I am stubborn but because they don’t allow it.

Any help is appreciated, thank you!