I HAVE FOUND A SOLUTION TO NUMBERSYNC NOT AVAILABLE WITH GALAXY WATCH AND GALAXY PHONE.
As I once was a victim of NumberSync not available.. I found a solution that works for me! This should work for all of you with the same issue. Here is what I did, and let me tell you... I TRIED EVERYTHING.
I will be very brief. My issue was my Galaxy 42mm watch and my Note9. Originally, new out of the box everything was well and worked perfect, then i started having issues with the watch itself, so i factory reset it.. Well i lost my QR code to reactivate to the LTE Network. So I went to an ATT store and got a new one. Cool! Got my watch back onlline to LTE (standalone or bluetooth paired only)... Which means I can still use the watch to text and call.. But i can only use it with the eSIM # it has. Not my phone number.. However after I got the watch back online, the next step is to do NumberSync.. Well i tried for days and called tech support and got a ticket, etc. Nothing...
So I had an idea.. Something i stumbled upon while looking at my online account info. Here was my fix!
IF THIS HELPS PLEASE LIKE! ALSO, WHEN I SAY I WAIT A HALF HOUR, ITS FOR THE NETWORK TO UPDATE THE SETTINGS YOUVE CHANGED. THIS WONT WORK IF YOU DO ALL STEPS IN 5 MINUTES. LET IT TAKE THE TIME TO UPDATE!