Finally figured out that the 'invalid password' error I was getting was for the Wi-fi not spotify. You need to enter the Wi-fi password on the watch. I would of thought it got that from the app, but oh well.
Ma Isabel F Basilan
Working well for my vivoactive 3 music. Although I had to update via Garmin Express on pc first before it did.
It doesn't work on my Garmin 5 plus....tried many times