A device may be paired with your pc but not connected to it. Pull down the notification shade of your phone and look for the bluetooth icon.

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Bluetooth keyboard paired but not connected. The dell bluetooth keyboard and mouse must be paired both outside the operating system and then again after the operating system loads. This issue particularly arises if you use more than one bluetooth device or when you connect the bluetooth device. Restart your bluetooth service on your keyboard press the windows logo key and r at the same time to invoke the run box. We will simply use the action center to select and connect to the device. Below are the instructions for connecting the keyboard and mouse outside of the operating system. Connecting to the paired device.
The keyboard or mouse is bluetooth 20 21 30 or 40. Make sure your mouse or keyboard is paired with your pc the pairing light flashes three times then turns off why there is a delay before a bluetooth mouse responds after it has been inactive. Right click the bluetooth radio and select properties. In general bluetooth is backward compatible. You can pair and connect paired bluetooth devices on windows 10 from the settings app. In device manager click the arrow next to bluetooth and select the bluetooth radio.
Bluetooth devices supporting the bluetooth 5 standard should still be able to pair with devices using say the ancient bluetooth 21 launched back. Press the windows a to launch the action center. Locate your bluetooth device from the list of connected devices and select its name. Right click on start and select device manager. Sometimes you have to connect to an already paired bluetooth device. Open the windows 10 start menu then select settings devices.
Restart the computer and then pair the device. Toggle the bluetooth connection if the bluetooth connection could not be established or if you fail to pair two devices then the first and the most basic step of troubleshooting is to toggle the bluetooth connection. Type servicesmsc and press enter. Then select remove device. The only problem is that pairing is something you do once when you set up your device. This works even if you have previously connected the keyboard or mouse and they are no longer paired.
You can check these settings by doing the following. Pairing a bluetooth device is not the same as connecting to it. Right click on bluetooth related services like bluetooth handsfree service bluetooth support service and click.