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I am having the same difficulty! The suggestion on xfinity page DOES NOT WORK! I tried parental controls to block application but YouTube still opens! I can't even uninstall it!! Did you find a solution??
Same issue. Waisted 2 hours chatting with useless support person who eventually even tried to sale more services. Obviously Comcast has some special relationships with YouTube that prevents it from blocking. Looking forward either to buy own router or switch internet provider.