NEW Comcast Xfinity Gateways won'y connect my Echo any more

[echo8657]

NEW Comcast Xfinity Gateways won'y connect my Echo any more

Comcast force my to use their new Xfinity Gateways , not nothing works, and I have been ask / search the internet for months without any real solution.



Can someone have this issue before and finally got it fix tell me exactly what to in Xfinity Gateways to make it work?

Don't tel me : change ISP, change router etc... please





Background fact:

-Echo dot was working before router change.

-Echo dot initial setup before new Xfinity router was very easy , just download Alexa app on my phone, and very smooth.

-After new Xfinity router setup, PC and other 2 Tablet (Fire HD8, HD10) which connect to wifi are working fine, internet is working.

-NEW Xfinity router have wifi SSID, with WPA2-PSK(ASE)

-NEW Xfinity router set to minimum security(Low)



I have try:

1)Factory Reset reset amazon echo dot 3rd generation, the use phone/2 Tablet Alexa app try to setup again , Got stuck at Alexa cannot find "Amazon-xxx".

Deregister echo dot on amazon account , then go initial setup again doesn't work either, Got stuck at Alexa cannot find "Amazon-xxx".



2)Deregister echo dot, then go back to intial setup again, doesn't work either, Got stuck at Alexa cannot find "Amazon-xxx".



Comcast Xfinity not helping , no real solution.