The Surface Dock 2 is compatible with both the Surface Pro 11 (ARM-based) and the Surface Pro 7 (Intel-based), but there are key differences in their architecture and software environments that may lead to issues.
Ensure the Surface Pro 11 and the Surface Dock 2 have the latest drivers and firmware updates installed.
Ensure you're connecting the monitor to one of the two USB-C ports on the back of the Dock and not a USB-A port.