My custom domain botifybot.co repeatedly fails TLS certificate issuance with:

“Failed to issue TLS certificate — An internal error occurred.”

I have already verified the following:

• The domain resolves correctly to Railway.
• The Railway verification TXT record resolves correctly.
• DNSSEC is disabled.
• There are no CAA records blocking certificate issuance.
• Railway Network Diagnostics completed successfully with HTTP 200 OK, successful DNS resolution, completed traceroute, and 0% packet loss.
• The website itself is reachable through botifybot.co, but HTTPS shows a certificate hostname mismatch.

The certificate repeatedly changes from:

“Certificate Authority is validating challenges”

to:

“Failed to issue TLS certificate.”

Could you please check whether this domain has hit a certificate rate limit, or whether there is an internal Railway certificate issuance error?