Xbox and PC account?

I have a PC and an Xbox. I have two copies of Black ops cold war. The first copy was gifted to me and was put on my PC. I later purchased another copy and downloaded it on the Xbox. Me and my kids were able to play together and now we cannot. I purchased the second copy under the same microsoft account that my PC, first account is registered under. I made a microsoft account for the kids with the xbox. When you try to open the game under one of the kids user names it states it has to be signed in by the person who bought it. If you sign in on the XBOX  using the user name of the person who bought it it will kick me off my PC if i am signed on there. I was able to  sign in on the xbox with the first account and then switch user names and get both to work together but it is not working anymore. Is there a way to move the game off my microsoft account and put it under the microsoft account of the kids or is there another fix.

thank you