What do I do if the 6-digit code does not show up on my Apple Watch?

tannor12, A little more info would be helpful. On your iPhone in the Watch App did you check passcode> Make sure passcode is turned on and then make sure Simple Passcode is turned off? With it off you can have a passcode bigger than 4 digits.

If you're trying to pair the watch it would help if we knew what watch and what phone it is and what version of software is on both devices.I think this is what you're looking for.