Cannot access mitm.it

I downloaded v4.0.4 of mitmproxy for Windows and am running it on Windows 10.

When I run mitmweb, and configure my iPhone’s network settings, I cannot access mitm.it on my phone. The pages does not load at all.

I tried running mitmproxy on a Mac to see if my phone was the issue but everything worked smoothly, and I could access mitm.it on my phone with no problems.

Thanks.