A rendering error occurred: Cannot read properties of null (reading 'fields').

Throwing my name into the hat as well with the same issues for the past few days. And yes Xfinity, we have all tried the troubleshooting steps. It's not on our side. We missed out on the rewards yesterday due to this.

Xfinity needs to compensate users who were not able to claim rewards due to this problem that prevented them from access, and now, of course, the good rewards sold out already (free movie and gift card).

Just got off the phone with support. I was on with regular tier 2 support.  The membership rewards team seems to be a really small division of Xfinity. He said the only way for other support teams to actually communicate with membership team is through a chat messenger rather than the normal support channels. He said that normal support would just go in circles for this very reason. I assume that is why it has taken so long for anything to even be done and I still don't think anything has been done yet. Hopefully this will change. 

At least now it's in the correct issue queue and should be seen by people that can fix it. 

A rendering error occurred: Cannot read properties of null (reading 'fields'). still occurring 5 days later with the Member Benefits.   No valid response from your AI customer service bot.   It looks like the change to yahoo email and some other security change disconnected my comcast.net email form my account I am having issues frequently even logging in to pay my account.   It changed the default email and my status as a diamond member.  No Member benefits for about a week.   No customer service number to get help and just an AI chat bot that is no help.   I think it will just be easier to cancel my service and choose a different competent internet service provided that doesn't ignore customer issues and send them to an AI Bot.   Terrible service!!