Since the Surface Pro 4 got rid of the Windows Button on the bezel we can no longer use the Windows Button + Power Button combination as with previous Surface models.
I chatted with Microsoft tech support and the best thing they could come up with was to press and hold the Clock for 3 seconds and then call up the on-screen keyboard and then press Ctrl+Alt+Del. This takes a lot more time.
Is there a more efficient way to get past the Ctrl+Alt+Del screen on the Surface Pro 4?
Edit: (It turns out that pressing and holding the clock doesn't even work on Win10/Surface Pro 4 so that wasn't even an option). A big thanks to "mtid" for sharing the real answer.