New PC, Dynamic Lock is paired to my old phone doesn't recognize New Phone

Dynamic Lock uses a Bluetooth-paired phone and locks the PC when that phone’s Bluetooth signal drops below a threshold and the PC is idle. If the old phone was removed, the new phone must be paired successfully in Windows before Dynamic Lock can use it.

Try this end-to-end check:

1. On the PC, pair the new phone again:
   • Go to Start > Settings > Devices > Bluetooth & other devices.
   • Select Add Bluetooth or other device > Bluetooth.
   • Put the new phone in discoverable mode, select it in Windows, and complete pairing.
   • Expected result: the phone appears as a paired Bluetooth device.
2. Make sure the old phone is no longer paired in Windows:
   • In Bluetooth & other devices, confirm only the current phone is listed for this purpose.
3. Turn on Dynamic Lock in Windows sign-in settings:
   • Open Windows Sign-in options.
   • Turn Dynamic lock On.
   • Dynamic Lock uses the paired phone’s Bluetooth signal and can lock the device within about a minute after the phone is out of Bluetooth range.
4. Test it correctly:
   • Leave the PC idle and take the new phone away.
   • Dynamic Lock only locks the device when the Bluetooth signal drops and the system is idle. If the PC is being used, it won’t lock immediately.

Important notes:

• Dynamic Lock is an extra protection layer, not a replacement for manually locking the PC.
• Microsoft recommends the default Dynamic Lock signal settings because Bluetooth signal measurements vary by environment.
• If the new phone does not appear during pairing, make sure Bluetooth is turned on and the phone is discoverable, then pair again.

References:

• Dynamic lock
• Sign-In Options in Windows
• Pair a Bluetooth device in Windows