The link that Keith posted together with the subsequent links from that link should answer most of your questions ... BT generally expect to supply the Youview boxes for use on their service so to put it simply if you opt for a BT multi room service BT will expect to supply a second box ( and charge accordingly) unless you already have 2 boxes supplied to you by BT .
Currently it is possible to use your own acquired Youview box in place of the BT supplied one(s) but logic of the BT systems will expect you to have 2 BT supplied Youview boxes to take the multi room subscription.
You need the "Extra Box" add-on to connect two boxes to the BT TV service.
@umpire wrote:
The TV Everywhere is to do with also watching content on additional different devices such as tablets. It doesn't allow you to use two Youview boxes. The Extra Box subscription allows that. Sounds like you were wrongly advised?
BT TV on the Go or TV Everywhere is included with certain TV packages. The only add on for other TV packages that I believe BT sell which includes TV Everywhere is refered to and shown in the tariff guide as TV Everywhere with Extra Box.
@zulu17 wrote:
BT TV on the Go or TV Everywhere is included with certain TV packages. The only add on for other TV packages that I believe BT sell which includes TV Everywhere is refered to and shown in the tariff guide as TV Everywhere with Extra Box.
According to this page the Extra Box subscription also includes BT TV on the Go (have they renamed TV Everywhere?).
http://bt.custhelp.com/app/answers/detail/a_id/48891/~/extra-box-with-bt-tv-on-the-go
Possibly Extra Box is what was actually ordered? If so then the additional channels should work on the second box. It's the Extra Box bit that is relevant for that. The BT TV on the Go relates to being able to use the BT TV app on other devices as far as I can see.
Are you able to check the order details through MyBT?