Comcast.net emails will not load while on Wifi with IPhone

Four days ago, our Comcast.net emails stopped loading while on Wi-Fi via IPhone when clicking the MAIL icon on the task bar of the IPhone. I can however access our emails via the Xfinity website on the IPhone & laptop using Wi-Fi, but nobody wants to go through that just to check emails. If I turn Wi-fi off the emails load no problem using the MAIL icon. I've called my internet provider (Spectrum) and Apple with no resolution. I've tried to get advanced support from Xfinity and cannot get anyone to answer the phone. Apple rep said he read a note in their files that someone had a Hard Password Reset performed and that may solve the issue. No idea why only our Comcast.net emails won't load but Outlook and GMail emails load just fine on Wifi.