Changed my email address with Xfinity but service-related emails still going to old email address

I updated my email address with Xfinity a while back.  Bills are going to the new email but some account-related emails still go to the old address (e.g.,"Still unclaimed: Your Peacock Premium perk.”).  How do I get these to my new email address?  I have looked all over the site, including "Manage Xfinity communication preferences".  Thanks.