Hello @architek0, welcome to the Let's Encrypt community.
Here is a list DNS providers who easily integrate with Let's Encrypt DNS validation
This is what I see with nslookup; I find is odd that _acme-challenge.agoratsp.com has an IP Address but no TXT record.
$ nslookup
> server ns1.contabo.net.
Default server: ns1.contabo.net.
Address: 79.143.182.242#53
Default server: ns1.contabo.net.
Address: 2a02:c205:0:882::1#53
> set q=any
> agoratsp.com
;; Connection to 79.143.182.242#53(79.143.182.242) for agoratsp.com failed: timed out.
Server: ns1.contabo.net.
Address: 79.143.182.242#53
Name: agoratsp.com
Address: 38.242.206.228
agoratsp.com mail exchanger = 10 mail.agoratsp.com.
agoratsp.com nameserver = ns1.contabo.net.
agoratsp.com nameserver = ns2.contabo.net.
agoratsp.com nameserver = ns3.contabo.net.
agoratsp.com
origin = ns1.contabo.net
mail addr = hostmaster.contabo.de
serial = 2023020401
refresh = 3600
retry = 7200
expire = 2419200
minimum = 10800
>
> _acme-challenge.agoratsp.com
;; Connection to 79.143.182.242#53(79.143.182.242) for _acme-challenge.agoratsp.com failed: timed out.
Server: ns1.contabo.net.
Address: 79.143.182.242#53
Name: _acme-challenge.agoratsp.com
Address: 38.242.206.228
>