Service-Related Emails Going to Old Address

Long story short, I’m having the exact same issue as: https://forums.xfinity.com/conversations/signin-and-account-management/service-related-emails-going-to-old-email-address/664011a13b3493797daaeb3c

Like that post, I changed my email address some time ago (longer than a year ago in my case). The old email address does not appear anywhere on my account. My new email address is the sole address on the account and is my preferred address. I cannot sign in with the old address. Yet, “Service-Related” emails come to the old address. Because of their nature, there is no link to manage preferences on those emails.

And like that post, I’m hoping someone from Support will invite me to DM so I can get this resolved.

Thanks in advance for your help!