The issue is certainly frustrating and if you are facing it as well, then we can help you fix it.
You need to go through this blog properly to learn how to fix Apple Watch pairing issues.Note: Apple Watch is not compatible with iPad or other Android gadgets and it needs a minimum 6/6 Plus or else the newer version.
Go for a reboot of your iPhoneFirstly, long press on the Sleep/Wake button of your iPhone till the toggle of switch off gets displayed.Then, you need to push the toggle on the right-hand side.
Observe that your iPhone device will be switched off.As soon as it completes many seconds of being switched off, you need to do a long press on the Sleep/Wake option until the symbol of Apple gets displayed.Whenever your iPhone is done with the booting process, you need to see the Apple Watch connection.
Go for a reboot of your Apple WatchFirstly, long-press the button on your Apple Watch just below the crown.Whenever asked, push the power off option on the right-hand side.As soon as the display gets dark for some time, press the digital crown for switching on the Apple Watch like earlier.
Note that the symbol of Apple gets displayed on the screen.