You dont actually need the connect app for this (or anything!) - your Hub should just connect to the network.
Can you connect a device to the Hub on an ethernet cable and see if that connects to the internet?
Is this a "new connection" or one that has worked until recently?
What are the various lights on the Hub3 showing/doing/flashing?
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John
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I do not work for VM. My services: HD TV on VIP (+ Sky Sports & Movies & BT sport), x3 V6 boxes (1 wired, 1 WiFi, 1 on PA) Hub5 in modem mode with Apple Airport Extreme Router +2 Airport Express's. On 250Mbps, Talk Anytime Phone, x2 Mobile SIM only iPhones.