I noticed that the Features / OS grid shows that on Android devices a mouse is NOT supported.
I have a Samsung Galaxy Tab A7 10.1 inch tablet running Android 12 and I am using a Samsung S (Bluetooth) Action Mouse paired with this tablet.
So far in my limited tests, the mouse IS working! Hurray! I can control and interact with my desktop via the Windows Spacedesk driver on my Windows 10 desktop PC.
Spacedesk is particularly useful to support a remote touch screen application to control DAW (Digital Audio Workstation) software.