Error under 4G/5G connection

[apicedigital]

I’m having a very annoing issue with my app every time I connect to my 4G/5G network.
When I reach my app domain (tembanheiro.ai) through a wifi network it works fine even if I disconnect from it and use 4G network, but when I open a new tab and try to reach it from my 4G network I get the DNS_PROBE_FINISHED_NXDOMAIN error.
I’ve tried to clear the cache and from different browsers, nothing seems to work.
Don’t know what to do actually…