Xfinity email on Gmail app "Blacklisted IP"

I am traveling. A few days ago I noticed my comcast email not updating, not even getting the usual spam. Today I cleared Gmail app cache, reset phone, no luck. I re re-entered my login credentials and got a popup notice that my IP was blacklisted.  What the heck?

I am a 21 year comcast customer, been using 3rd party email apps (10 yrs iPhone, 5 years Android) with only a few brief outages.

Need this FIXED! If comcast and its new email provider plan on complying with their internet service contract, this cannot languish or I'll be speaking with tbe "retention department".

Using Android Samsung S24FE, android OS 16, recently updated. Cell provider is US Cellular. I am probably outside of their service area. Connecting via 5G service, not wifi.  Resetting phone should cause a new IP address assigned, as does driving in and out of cell covered areas, like I did this morning. 

Using current Gmail app, ver 2026.03.09.884664556.Release. 

I am able to log in via browser, but email this way is unwieldy, at best.