I am unable to activate Peacock on my Xi6 boxes. Does anyone know how to help me?

I have TWO TVs and TWO Xi6 boxes - one is a Xi6-T and the other is a Xi6-A

for YEARS I have been able to watch Peacock for free, as part of my xfinity plan. It worked fine.

Then in the last couple of days it stopped working and is asking for me to Activate it on my Xi6 boxes.  But when I try to activate it shows the subscription is already active.

And indeed, on my iphone, in the peacock app, it links automatically to my xfinity account and I have full access to all content.

But on my TVs, via the Xi6 boxes, I can't link to my xfinity account.

NOTE this just happened, and (again) I had been watching Peacock for a number of years as part of my xfinity plan.  

I have spent many hours with support agents (many agents!) and they are unable to help me.

To summarize:  Xfinity shows my Peacock subscription is ACTIVE.  I can watch Peacock in the APP on my iphone.  I can not access my subscription via my Xi6 TV boxes.  This problem happened in the last week or two.  I have been successfully watching Peacock for YEARS prior to this.

Does anyone have any ideas what I should try?  

Thank you!