Problem description: My custom subdomains are not linking after 2 or more days. I have been using 내도메인.한국 for my subdomain provider and it worked 2 times before and now it doesn’t work. (NOTE: The provider doesn’t allow CNAMEs and TXT records to be added together.)
Custom domains worked fine for me today when using CloudFlare. Maybe try using CloudFlare as your DNS service (it’s free and you can link with your existing domain!). Replit also recommended it on their post talking about this issue.
We believe that some DNS services have recently started adding an A record alongside a CNAME record even if a user only explicitly adds a CNAME record for their subdomain. This prevents our system from properly verifying the domain, especially if the DNS service blocks TXT records on the same subdomain as another record.