So it has to be something in connect mobile and not me. I tried reinstaling chrome etc. I even have new firmware for my phone today (s9). I hope garmin will fix it.
Same for me :( bought my Vivoactive 3 Music yesterday; when trying to set up Garmin Pay I am just getting the same blank screen each time I select any card. Hoping for a speedy reply or fix from the Garmin team.