Is there a way to fix this? I thought this was available in all regions

So i thought i got the fix for the problem,

i changed my account region to the region where i bought the game but now it says that the dlc isn't available for my region, when i click "X" in the menu for downloadable content it gives me a message saying "There is no downloadable content available for
your region" Is there a fix for this region problem?

It depends. What is your account region and what region are you physically located in?

If you are in a region where the game is available, it can be fixed. If you are not, then there is no way to fix it. There is no way around region locking.

Unfortunately, there is no way to fix it. The game is region locked. In order to redeem it, your account region has to match your physical location and you have to be in a region where the game is available. Since Romania is not a supported region, the game is not available there.

Unfortunately there is no way to fix that. Bulgaria is not a supported region so Game Pass is not available there. http://xbox.com/regions

Unfortunately not all countries are supported by Live. It typically comes down to rules and regulations in that country that the government and Microsoft have to agree to. I'm sure Microsoft would love to be available in all countries, but until they are
made available in your region, there is no way to fix that.