Update driver > Browse my computer for drivers > Let me pick from a list of available drivers on my computer from the list, then look for Generic Bluetooth Adapter Microsoft Bluetooth Enumerator Check Hardware ID
Look under or Other devices (if the driver is missing). Isscbta Bluetooth Driver Windows 11
For advanced users: If Windows 11 blocks the driver due to signature enforcement, you can temporarily disable it: Update driver > Browse my computer for drivers