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We just switched modems and the Cox modem recognizes two of my televisions but it does not recognize my third television. We are trying to get air play on the third television via an iPAD but are unable to get Youtube TV on the television.
What do you mean by "not recognizing"? Does the 3rd TV see the network name(SSID)? If not, try moving it closer to the modem. As for Youtube TV, what are you using as a device? The internal TV app?