I had the same issue with XFinity voice remote. the 3 digit code kept appearing on the main TV only. I fixed the problem by restarting the system, i.e., the update that starts with "Welcome" etc. The code then appeared on the correct TV and voice control is now functional. One important note: The remote was paired with the TV except the voice control function. Functions worked that could only work with the set top box paired. The "volume" control and "on"and "off" may work if the remote is not paired but functions that can only work if the set top box is paired like "record ", "info" and "guide" worked BEFORE the voice control feature was paired so it is incorrect to say, at least in all circumstances that the absence of the 3 digit code means the remote is not paired. Also, the Xfinity pairing instructions very clearly indicate the voice remote pairing is a separate step. You can choose NOT to pair the voice remote feature. Hope this helps anyone with this issue!
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