[Connection not secure for zoom.us]

Hi All,

I have tried to get to log in to zoom.us so that I can video meet, I also can't log into the IOS zoom app on my iPad or phone.  when I connect via magenta mobile internet or home 5G mobile internet the site is blocked and I get an invalid security certificate warning for a certificate *.tech.t-mobile.at  I tried to click to go to the zoom.us website anyway and now I an stuck on a blank white page at the address https://saferinternet.tech.t-mobile.at/cms-blockingpage-webui/faces/login.xhtml .  Does anyone know how to access zoom.