Who I have the same questioned this topic

I can't live stream ESPN even though I'm able to watch on the set-top-box. I've tried Apple TV, Fire Stick, iPad, iPhone and PC, but receive an error message every time. Sometimes ESPN2 and other channels will stream, but never ESPN (yet it always works on my set-top-box). This is solely about ESPN content (i.e. Sportscenter) and not ESPN+ content (I don't pay for that). The error message is usually "not part of your tv package", "not part of your tv plan," "unauthorized user" or something else along these lines (seems to vary by device). 

I've spent 6+ hours on the phone with Verizon and they keep telling me its ESPN. I've spent many hours troubleshooting with ESPN and they say it's Verizon. I've even had both on the phone at the same time and they still pointed fingers at each other. My guess is it's an authentication issue on Verizon's part. There's too much for ESPN to lose in this equation for the error to be on their side. 

I've tried logging in with different internet connections (not just home network), rebooting, wiping cookies/cache and factory resetting devices/browsers/modems/STBs. Nothing has worked even for a short while. 

Any help/suggestions would be much appreciated. Thanks ahead of time