Zwift Video File with 0 Byte - Win11 - Ryzen7

The video function is enabled in the Zwift game on my PC (Win11 Home - Ryzen 7) and the button is also active in the game. Clicking the button creates an mp4 file of 0KB in size (in the Zwift folder on my PC).

Obviously a file with no content will not launch.

What could be wrong?