Surface book Miracast?

Hi there.

Running a Surface Book (i5, 8GB RAM, dGPU) and I am having an issue where I can never seem to connect to Miracast devices.

I have tried 2 or 3 different devices where I am connecting using the "Connect to a wireless monitor" option under the windows+P command with no luck. It finds the device and starts the connection and in some instances says "Connected" but then nothing happens or it seems to reset or stop.

Normal Screen sharing using cable works fine so I know it's not a resolution issue. Or at least think it's not a resolution issue.

Any thoughts?