Let's Debug

Test result for pool.cg.ru using http-01

No valid A or AAAA records could be ultimately resolved for pool.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 18:43:58 2020. Sat in queue for 1ms. Completed in 3s. Show verbose information.