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Okay I setup two new Comcast DTA's and here is my experience that I post about troubleshooting.
*If you order two DTA you must hookup both DTA to two TV's.
*Online activation does not work at all
*Try Live chat at Comcast. They manage to get one of my DTAs to activate remotely.
*The other appeared to get stuck on one channel. So what I did was call the phone number on TV screen which activates the DTA by phone.
Now both my DTAs are working great. The negative I have to Comcast is that they only give you two for free and you have to pay extra 1.99/month for each additional one.