upstream request timeout message ONLY for HEB websites

Per HEB technical support, in order to update my email address, I was told to simply delete my HEB online account, and then create a new one with my new email address.

I successfully deleted my account. However, now, no matter what HEB website or HEB webpage I try to go to, I get this message:

" upstream request timeout "

I'm on 2014 iMac running:

Big Sur   Version 11.7.9

Safari Version 16.6