Hi @code_me
There is an issue with the DNS configuration for islnetwork.org
Neltify nameserver as visible alongside registrar nameservers.
% dig islnetwork.org NS
islnetwork.org. 3600 IN NS ns57.domaincontrol.com.
islnetwork.org. 3600 IN NS ns58.domaincontrol.com.
islnetwork.org. 3600 IN NS dns1.p04.nsone.net.
islnetwork.org. 3600 IN NS dns2.p04.nsone.net.
islnetwork.org. 3600 IN NS dns3.p04.nsone.net.
islnetwork.org. 3600 IN NS dns4.p04.nsone.net.
If you wish to use Netlify DNS you will need to remove the two domaincontrol.com nameservers. If you wish to remain using external DNS you need to remove the nsone.net nameservers.
Adittionally, there are no A, AAAA records for islnetwork.org however there is a CNAME record for www.islnetwork.org
% dig www.islnetwork.org A
www.islnetwork.org. 3600 IN CNAME apex-loadbalancer.netlify.com.
apex-loadbalancer.netlify.com. 300 IN A 75.2.60.5
apex-loadbalancer.netlify.com. 300 IN A 99.83.231.61
However this record is incorrect as the apex-loadbalancer.netlify.com is designed for the apex domain, not the www subdomain.
Check out this support guide along with the above linked documentation which will guide you in correctly configuring DNS.
You can also find related support guides in