I can sign in, but I can't access 'My Account'

I can sign in to my.xfinity.com and the the Xfinity My Account App.  But on the website, the My Account, Account Settings, and Billing tabs do not work.  They all throw an error message that say "Sorry, this isn't working right now. Please reload the page and try again." 

This error has existed since long before I bought cable TV.  Representatives suspect this has something to do with the fact that I have a few old/closed accounts associated with old addresses that may need to be linked or unlinked from the current account.

The reason I need this issue resolved is because the linking/unlinking of accounts is apparently causing problems where I now can't access all of my purchased cable channels on the Stream app.   And on xfinity.com/stream, I receive TVAPP-00114

Troubleshooting steps taken:

1. Multiple hours on the phone with multiple representatives, escalating multiple tickets. 

2. Uninstall/reinstall of apps and multiple browsers.

3. Clearing of cache, history, etc and use of incognito mode. 

4. Scouring the internet for answers and tweeting customer service. 

Tickets: 

1. IH187337388

2. IH188978426