On Xiaomi/Redmi devices running MIUI, there’s an additional security restriction on ADB. Enabling just USB debugging is not enough — you also need to enable another toggle in Developer Options:

Open Settings → About phone → MIUI version → tap 7 times to unlock Developer Options.

Go to Settings → Additional settings → Developer options.

Enable both:

• USB debugging

• USB debugging (Security settings) ← this is the key one

Reconnect your phone and tap Allow when the authorization prompt appears.

The “USB debugging (Security settings)” option allows ADB to simulate input events (mouse/keyboard), clipboard actions, and other advanced features. Without it, Xiaomi blocks those for security reasons.

Note: Sometimes this toggle only appears if you’re signed into a Xiaomi account and connected to the internet.