Cannot stream video to Twitch or YouTube

I've been streaming for some time (a few times each week, for 2'ish hours each time), with no issues. However, today I am not able to stream to either Twitch or YouTube. I've tested with multiple accounts on each platform, and using different applications on 2 different laptops. The results are the same. All frames are being dropped.

Spent a couple hours on the phone with Xfinity tech support. Other services seem to be working fine, and speedtest looks good. It is only streaming that seems to be affected.

I believe I've experienced this before, on the same day of the week (Sunday). 

I found another thread on this forum speaking of the same thing, but unfortunately no fix was shared. https://forums.xfinity.com/t5/Your-Home-Network/Cannot-Stream-to-Twitch-or-YouTube-Anymore/td-p/3218822