I’ve got the same issue. Spacedesk does not work via USB connection. Tried different USB ports in my laptop, tried different USB Cable.
I’ve attached the diagnostics files which I gathered while I pluged in an USB 3 port (C in tablet, C in the laptop).
Laptop: DELL with Win11Pro 23H2 (22631.4169), x64, Intel Core i7-1265U 1.80.
Tablet: Lenovo Tab P11 Pro gen 2 (Model: TB132FU), Android 12
Spacedesk Android app: v2.1.15
Spacedesk Win app: 2.1.22