Hi @Anonymous User
To be honest i am a novice at home networking and only have some basic limited knowledge.
With an "unmanaged" Gigabit switch it should be plug and play with no settings needed from what i understand.
My 8 port Trendnet Gigabit unmanaged switch works like a dream on my NowTV Hub 2 router, where i also jumped across from BT Fibre.
I would double check with the model number on your TP Link switch (maybe on the id sticker somewhere on the switch) that there is no "E" on the end of the switch model number which denotes it is a "managed" switch.
If you are getting no joy and somebody with more knowledge on here than me doesn't come up with some further advice.
Then is there anyway you can test your TP Link switch on somebodies else home network (such has a friend or family member) just to prove it works with another router since moving to NowTV Fibre ?
You could also maybe look at using your old BT Router as a WAP with the Hub 2 and utilise the Ethernet ports on the BT HomeHub.
If it was me and i couldn't get the existing TP Link switch working and to avoid all the faffing around i would consider picking up a new unmanaged switch from Amazon or Ebay perhaps a Netgear or Trendnet Gigabit switch.
Also, have a read of this link on the Sky Q Hub forum discussing the limitation with only 2 number Ethernet ports and what options people have done to overcome this.
https://helpforum.sky.com/t5/Archived-Discussions/Sky-Q-Hub-Only-2-Ethernet-Ports/td-p/2422925
