Does S33 work on comcast?

I purchased an Arris S33 modem from Amazon. I connected it and got a blue light but when I used the activation on the app, it would fail almost immediately and tell me to chat with support. I spent 45 minutes on the phone with support and they weren't able to resolve it. They said they would call back but never did. I called Arris support and they couldn't solve it either so said it was probably the modem and i should return it. I then went to best buy and bought another S33. This time the activation didn't fail immediately but after 10 minutes said it couldn't find my modem. I tried a few more times moving upstream on coax connections until I got to the coax coming directly into the house. Still couldn't find the modem. How am I supposed to get this modem to work?