I recently received a OnePlus Watch. I turned it on and it told me to either scan a barcode from the HeyTap Health App or manually pair using bluetooth on my phone. I use a OnePlus 5T. I tried pairing manually and the watch prompted the pairing code which I accepted on my phone. My phone says that it is connected to the watch however the watch goes back to the initial screen where it asks me to scan a barcode. After this I am unable to do anything on the watch.