I did this and my number sync keep turning off. I've spent 2 weeks and countless visits and I'm ready to throw the watch away. This isnt worth the time I've spent to resolve this!! So frustrated.
Thank you so much for sharing. I changed my Samsung account ID and the numbersync worked. This post should be at the top for everyone that is having this problem to see. I originally was using my AT&T account ID and I believe that is what most people have been doing thus causing the numbersync issue. My esim number is linked to a different email address than the one I use for my phone service and now numbersync works.