Using the Duo (v3.0.0-prodn) on a Galaxy 21+ (SM-G996U Android 12). The Duo works fine via USB A to a PC but when tested on cell phone using the USB C shell the led illuminates and can change profile but has no response when activating any slot in any profile. Onlykey (2.1.2-prodc) works activating any slot using same usb C shell.
The DUO is currently not working on some Samsung model phones, we are working on a firmware update to address this issue.