ALERT blacklisted IP address

I use xfinity email on my apple devices. It has been working fine for over 7 years. Now, when I try to download my email onto my iPhone or iPad while at home I get a message Service code “ALERT” server message “Temporarily blacklisted IP Address - try again later.

I have contacted customer service on the phone twice (ticket number [Edit: Identifiable information]) and each time they put me on hold, then come back after 10 minutes, then explain to me that they have talked to the right people and that I need to wait 24 hours then try again. It doesn’t work. I still get the same error.

Both email accounts ([Edit: Personal Information]) are affected. When I use a neighbors WiFi access, I don’t have this problem. So I am pretty sure the issue is my IP address being blacklisted by Comcast.

[Edit: Identifiable Information]