I can't establish a connection to another Bluetooth device from my Apple Watch Series 9
If you can't establish a connection to another Bluetooth device, there may be several causes of the problem.
Turn on Bluetooth on the other device.
Place the devices within 10 metres of each other.
Try establishing a connection to another Bluetooth device.
Check the user manual for the other device to see if it's compatible with your Apple Watch.
Turn on Bluetooth pairing mode on the other device.