Xbox backward compactability

will it ever be backwards compactable

You're trying to download your profile onto your Xbox One that you used on your Xbox 360, right? If it is giving you a connection error, make sure your console is in fact online and connected to the network via ethernet or wireless (preferably wired if
possible). Then, make sure the information you are entering onto your One console is correct. To verify it,
try logging into your microsoft account here.

Also, It could quite possibly be an issue with the IP type available in your area (IPV4 vs IPV6) that can a failure to download the profile. Remember that the 360s back then only used IPv4 connections. Xbox One consoles can sometimes pick up and use IPv6
connections, leaving the 360 side of your console (the 360 dashboard) unable to connect. There's no concrete solution to this issue yet but you can try these:

1. Power cycle your console, router, and modem (make sure that all cables are disconnected for at least a minute or so)

2. Change the console DNS to your ISP's provided DNS or the usual 8.8.8.8 / 8.8.4.4 DNS to connect to a public DNS setting. Alternatively, if you do not want to mess with your console settings, do this on your router settings instead.

3. Clear your MAC Address (go to Settings > All Settings > Network > Advanced Settings > MAC Address > Clear Alternate MAC (this should re-establish a connection with your current network, however, do this only if your console is unable to connect the net)

Unfortunately the game isn't on the backwards compactable list.

There's still hope. Xbox is not working on back compact for the Xbox one anymore as they shift focus to working on backwards compatibility for Project Scarlett. That doesn't mean they won't look at making more original Xbox and 360 titles back compact
on the Scarlett once it launches. They are just doing Xbox One back compatibility anymore.

Anything is possible, you just have to wait until the backwards compactable program accepts games again. Just be patient !