Blueprints Copyright

We are developing a game in full Blueprints, without any other programming language. Now, we wanted to make a copyright of the game but the problem is, the Copyright Office is saying the Blueprints nodes won’t work as source code, they want to see code and not nodes or they won’t accept the Copyright request.

Is there a way to extract the code from the Unreal Engine Blueprints nodes or Blueprints in general or any way to copyright it?

I think you can try to use blueprint nativization feature to convert bps into c++ code.

Agreed this is likely the best option. Note that you cannot claim copyright ownership of the underlying UE4 code.