Debug interfaces failing on laptop

When I try to call D3D12GetDebugInterface or CreateDXGIFactory2 with the flag DXGI_CREATE_FACTORY_DEBUG, the calls are failing on my laptop, but not on my desktop. Other calls work fine on the laptop – I just can’t initialize the debug layer. The desktop has an oldish GeForce 650 Ti, and the laptop is a Dell XPS15 laptop (latest gen), which has a GeForce GTX 960M. Both have the latest drivers. Any ideas what could be going wrong?