xBox 1 Gamertag

Black Op's map pack will only play on the original Xbox it was bought from unless you transfer your account to a new Xbox and are using the same gamer tag as originally purchased.

For example :

Xbox 1:

Gamertag 1 - Gamertag 2. (both accounts made on this xbox)

If Gamertag 1 purchased the content then everyone on this Xbox can access the maps.

Xbox 2:

Gamertag 1 (transferred from xbox 1) Gamertag 3. (made on this xbox)

If Gamertag 1 comes over to this xbox and redownloads the maps. Gamertag 3 will not have access to the maps as it is only allowed to be used under the usage policy by Gamertag 1.

--

I'm not sure if this intel will help shed light on your dilemma. Just seems not many people read the new usage policy on Black Op's map packs and it could be something to do with it.

I already used my Gold Trial and Xbox Gold Live on this account, if I make a new account can I reuse them?

I mean, if you used your free Gamertag change, yes, you will need to pay it.

No. Codes are one time use only. If you're using a One you can set the console as your Home for the original account and share the gold with the new account though.

Unfortunately that is correct the only way if you have used your free change is to pay for it at this point.