Hello, I'm trying to connect free kassa to the forum, but I can't register a store

Hello, I’m trying to connect free kassa to the forum, but I can’t register a store, tech.the cashier’s support gave the following answer: “it looks like Cloudflare is blocking confirmation,
we receive from you [source] => HTTP/2 503
contact your hosting support!
dns is also not visible yet
dnschecker.org/all-dns-records …u&rtype=TXT&dns=google
maybe after solving the hosting issue it will turn out”