https://spa.xfinity.com should have a form to request removal.  Note they say resolution time can be up to three business days

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Alex Brotman

Sr. Engineer, Anti-Abuse & Messaging Policy

Comcast

From: NANOG <nanog-bounces+alex_brotman=comcast.com@nanog.org> On Behalf Of Jason Kuehl
Sent: Friday, September 10, 2021 10:31 AM
To: NANOG <nanog@nanog.org>
Subject: Xfi Advances Security (comcast)

For whatever reason Comcast Xfinity is blocking my VPN URL. I've started the process to unblock, and I'm trying to get a hold of their security team to resolve this. I've been bounced around all morning. 

Does anyone have a contact at Comcast that can whitelist a URL or get me to a team that can understand what is going on for the block to happen?

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Sincerely,

Jason W Kuehl
Cell 920-419-8983
jason.w.kuehl@gmail.com