This worked for me with my Forerunner 235 on chromebook. This scenario probably wont happen with anybody, ever, but it shows that if your code isn't popping up, give this a try. Thank you so much Gabriel.
i did install bluetooth pair apps. try to pair and VivomoveHR appeared the code for few seconds. however the popup did not come up in my handphone (the apps) and instead it os only notification that the pairing failed.
dont know if my android is error or the watch
please help