I have two gamer tags? Xbox one and Xbox 360

I am having the same problem for weeks - gamer tag is . I have been on with support for hours and they have basically washed their hands of it. I can't see or use my account balance on xbox one only and only with respect to this gamer tag.
It works fine on 360 or on xbox one with another gamer tag. Any idea if our accounts will be fixed?

So in that case, would logging into xbox one with a 360 gamer tag allow a user to get all the backward compatible games, and then playing them with a xbox one gamer tag?

I have spoken with a few people in chat that are asking that question..

They had created a new gamer tag for xbox one, probably not realising that they could play both consoles with the same tag..

I know that Microsoft probably won't venture down the merge path, but it might be a nice option for some people..

Thanks for the quick reply.

He actually has a child account, but his 'gamer tag' is associated with my account. From what I have researched, you cannot move a gamer tag to a child account on an Xbox One. If that is not correct, any references to how to do it would be greatly appreciated.
If it matters, and I know it does for Xbox 360, I have an Office 365 subscription on my MS account. On a 360, that prevents moving gamer tags.

I have read this several times. Is this example using a 360? Will the Xbox gold subscription follow the gamer tag or the email account? This is not too clear if a person has a xbox one and 360.

I am having the same issue and I have no idea what the portal of power is. We both have our gamer tags on the Xbox One because we live in the same house yet when we are in the versus mode screen only one gamer tag shows up and that's for player one. Player
two has to play naked so to speak