In system android developer settings is only enable debug via USB and enable debug via WIFI. not via Bluetooth. Samsung S10 Android 11 security updates 1.8.2021.
but helped hint from other topic. from console run adb connect :5555
then it was visible in WFS. 2nd attempt another day don’t need it again.
=> Probably before start is needed confirm some authorization. In phone I set always allow on same wifi in mobile before 2nd attempt.
So remain only problem with build: Run on device failed with error: Build failed. Is somewhere some log output of builds to analyze what is wrong? I created primitive watch face with 4 text component: battery, heart rate, steps,date and 1 time component digital clock for time.