Forgot to mention I tried unblocking the IP/Domain in my Firewall settings, reverting my system clock to when the site’s certificate wasn’t yet expired (8/11/20) etc… I’m out of ideas and kind of sad that I’ll have to let go of this amazing site once and for all.
Edit: I also find it ironic that the introductory page of FireRTC (firertc.com) is FULLY functional with no problems besides the obvious sign up error, but their actual products (phone.firertc.com / app.firertc.com) have had many, many issues like this for as long as I can remember… like wtf man.