You can bypass all issues by using "internet sharing" on a computer, at least I know for sure it works on Mac. See below for a tutorial for Mac, please Google alternative guide for Internet sharing on Windows.
1. Connect your Mac device to router's wifi
2. Connect xbox/ps to Mac via Ethernet cable
3. On Mac, go to: System Preferences > Sharing
4. Under "To computers using:" - check the box for Ethernet/Thunderbolt ethernet
5. Lastly, in the left hand column, check box for "Internet Sharing" and click yes or whatever to confirm.
6. Ultimately, restart Xbox and you're good to go.
This method uses your computer's wifi connection to connect to xbox live/Destiny. You can still have one xbox connected to wifi as normal. All others must use this method, using separate computers.
Hope this helps all!!
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Thank you very much! I don't know why i didn't think of this. The solutions I had been using have pretty much stopped working over the weekend so really really glad this worked.