Could not issue an SSL/TLS certificate for www.domain.com

Hi @ComapaNld,

Yes, very likely.

Edit

Also here Permanent link to this check report shows a majority of the world cannot get a results for DNS query.

Let's Encrypt uses Multi-Perspective Validation Improves Domain Validation Security - Let's Encrypt; Geoblocking can also be an additional issue here.
Please see the following:

Edit 2

Further DNS checking:

Edit 3

See Hardenize: Comprehensive web site configuration test