Please fill out the fields below so we can help you better. Note: you must provide your domain name to get help. Domain names for issued certificates are all made public in Certificate Transparency logs (e.g. crt.sh | trendteknolojim.com), so withholding your domain name here does not increase secrecy, but only makes it harder for us to provide help.
Your domains' DNS configuration is far from ideal: DNS Spy report for trendteknolojim.com
Both names resolve to only one IP.
That's what we call "putting all your eggs in one basket".
Which might be OK (or unavoidable/affordable) for web services, but NOT for DNS.
DNS is extremely inexpensive (read FREE) and extremely required (read CRITICAL).
That said, your actual problem might be more of a firewall or IPS blocking certain countries or networks.
LE validates from several places on the Internet and some might be blocked by one of your "protections".
[blocking DNS is always bad for business]