SSL certificate not issued for custom domain on GitHub Pages

[geo-upgrade]

Hello,

I'm experiencing an issue with SSL certificate issuance for my GitHub Pages site with a custom domain.

Details:

Repository: geo-upgrade
Custom domain: geo-upgrade.ru
Pages URL:
Site is live and accessible via HTTP (returns 200 OK)
DNS check status: "DNS Check in Progress" for 5+ hours
HTTPS is unavailable: "a certificate has not yet been issued for your domain"
DNS configuration (verified via Google DNS 8.8.8.8 and Cloudflare 1.1.1.1):

A records: 185.199.108.153, 185.199.109.153, 185.199.110.153, 185.199.111.153
CNAME www: geo-upgrade.github.io
CAA records: 0 issue "letsencrypt.org", 0 issuewild "letsencrypt.org"
NS: ns1.reg.ru, ns2.reg.ru
DNSSEC: not enabled
All DNS records are correctly configured and propagated. The site responds on HTTP, but HTTPS returns a wildcard certificate for *.github.io instead of a certificate for geo-upgrade.ru.

I have already tried:

Removing and re-adding the custom domain in Pages settings
Reducing TTL to 3600 seconds
The issue persists. Could you please help with the certificate issuance or advise on what might be blocking it?

Thank you.

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