Spent a lot of time on this and you have no number to call, not starting out well. Xfinity says they do not support the s34.
Solved
S34 Xfinity says it does not support it
Best answer by SURFboard Moderator
If you are trying to activate the modem I would recommend try to do it yourself through the Xfinity app. Please ensure the S34 light is solid blue before starting the activation process.
For your convenience, you can check the list of approved and compatible services under Xfinity through this link.
http://arris.force.com/consumers/articles/General_FAQs/Service-Provider-Modem-Compatibility-List
For further support, you can visit us at www.arris.com/consumersupport
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