vivoactive 4s will no longer connect to wifi after recent update

me too.  looking for solution

Hello all.  Please follow steps below:

1. Hard reset the watch.  To perform a hard reset, press and hold the power button on your watch.  Ignore the "Power Off" question and the assistance alert (if applicable) on your watch, just continue holding the power button pressed down until the screen goes blank.  Once this occurs, you may release the button.  Allow the watch to sit powered off for a few seconds, then you may power it back on by pressing and releasing the power button.
2. Sync the watch with Garmin Express.
   • How Do I Install Garmin Express?
3. Re-test syncing the Spotify playlist.

Be sure to review the FAQs below as well:

Frequently Asked Questions About Using Spotify With Your Garmin Watch

I Am Having Issues with Spotify on My Garmin Watch

Instructions to Sync Spotify Content to the vivoactive 4/4S

I did this and it still says no known wifi networks found.  I can see the wifi networks on both Garmin Express and Garmin Connect but for whatever reason they will not sync to the vivo4s.  So still unable to add Spotify playlists.  

This did not help.  When I text the wifi networks from Garmin Connect it shows that the password are incorrect.  I have verified that they are correct on both networks.  

Same thing happened to me in the weekend. The watch complained about wrong password for the wifi. Also my Netatmo weather station went offline. The phone and laptop had wifi. Turned out that something had happened with the 2.4 GHz network, but the 5 GHz was working fine. After a warmstart of the router, the watch and weather station were happy again.

3807684

Let's see what rebooting your router does, like what worked for ovekvam.  If that does not work, please reply with the following:

1. May we, if necessary, have permission to email you?
2. May we, if necessary, have permission to view/access your Garmin Connect account?

same here.  Have reset my router, hard reset the watch, uninstalled and reinstalled Spotify.  Nothing works.  And now that I hard reset the watch I cannot get my Spotify music onto it so cannot play music from my watch at all now. When I test the wifi connection on the watch (from Garmin Connect); the connection works fine every time; but Spotify will not sync or download music.  So the problem is probably in the Spotify app.  If they don't fix it soon I'll just cancel my Spotify premium account and look elsewhere for music

I have tried every fix recommended 2-3 times each.  The router has been reset, the watch has been reset. Now I can't even get the Spotify app to download onto the watch, even though in Garmin Express, it shows installed.  The wifi connection works fine when tested with the watch but it will not sync or download music, saying "no known wi-fi networks found."  This has been over a month now with no access to music, which is the ONLY reason I bought this watch--to be able to listen to music while I run.