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Hi, I'm Nathan.Sorry to hear that you're having trouble with this but I'll do my best to help you.
What is the model number of your tv, Debora?Initially, can you go into the tv setup menu, under the network settings, and manually set the DNS server to 220.127.116.11 and let me know if you can open an app at that point?
Do you need help with this, Deb?