An the issue is only inside the network? I’d complain to IT about that, yeah. Maybe they are overriding the DNS record with their own DNS server or something.

Can you set your own DNS servers on your client devices? Does cloudflare or quad9 resolve it?

Do you have a static IP? If not, have you tried some kind of dynamic DNS like DuckDNS?

Is it just me or is the link missing from this post? Using memmy on iOS