Let's Debug

Test result for cg-sr-exch.cg.ru using http-01

No valid A or AAAA records could be ultimately resolved for cg-sr-exch.cg.ru. This means that Let's Encrypt would not be able to to connect to your domain to perform HTTP validation, since it would not know where to connect to.
No A or AAAA records found.

Submitted Jul 20 18:41:25 2020. Sat in queue for 2ms. Completed in 7s. Show verbose information.