To do that you'd need to: 

1) Press the Side button once

2) Scroll and find Spotify app
3) Swipe from right-to-left on to close it and then tap on Remove [X] to confirm.

If your watch is still responding - try standard reboot with these steps:
1) Hold the Side button for a few seconds 

2) Press on Power off icon then slide to Power Off the watch.

After a few seconds, press the Side button to turn the Apple watch back on.

If your watch is not responding - try forced restart with these steps:
1) Press and hold down the Side button and the Digital Crown at the same time until the watch powers off and then displays the Apple logo. The Watch will start after a few seconds.

As we all know it's best to keep your Spotify app updated, so you don't miss out any fixes and improvements. Updates on the Spotify app on the Watch are dependent on your iPhone. Steps for updating the App can be found in this article. 

Once you update the app, make sure that the Automatic App Updates are toggled on on both devices.
1) Get your iPhone and open the Apple Watch App 

 

2) Tap on General and then toggle the switch to enable Automatic App Install.

* By toggling this option on you're making sure that any updates to apps on your iPhone will also be installed automatically on your Apple Watch.

 

Alternatively, this option can be found on the Watch.
1) Open Settings 
2) Scroll down until you find the App store and make sure that Automatic Updates is toggled on.

Tip: Always reboot both your Apple Watch and your iPhone when you're making any changes to ensure that they're synced.

It's possible to reinstall the Spotify app from both your iPhone and your Watch. Below are the steps for each device.
Using your iPhone 

1) Open the Apple Watch App on your iPhone

2) Find the Spotify App

3) Tap on app's name and toggle off the option "Show App on Apple Watch".

 

After that reboot both your watch & your iPhone and install the App again by following the steps below: 

1) Open the Watch App on your iPhone
2) Scroll down to Available apps 

3) Click on Install next to the Spotify app's name.

 

Using your Apple Watch

1) Press the Crown button 
2) Touch and hold on any app icon until you see the option Edit Apps
3) Click on it and select the cross on the Spotify App
4) Click on Delete App

After that reboot both your watch & your iPhone and install the App again by following the steps below: 

1) Open the App Store on your Apple Watch

2) Search for Spotify
3) Click on the cloud icon and the app will start downloading

 

1) Tap Settings
2) Select General 
3)Scroll down to Transfer or Reset iPhone (for iOS 15 and later) 
4)Select Reset > Reset network settings.

 

By selecting that option you are making sure that all your current network settings and configurations are deleted while the default network values and options are restored. After the reset is finish reconnect to your Wi-Fi network and you'll be back online. Keep in mind that you'll need to reboot your Apple Watch after resetting those settings.

Last but not least, we always recommend keeping both OS version and the Spotify app's version UP TO DATE. By following this piece of advice you'll be sure that errors and exploitable vulnerabilities are patched. It's important to always check for pending updates and install them. Again we can do that from the iPhone and from the watch itself 
Updating Watch OS from your iPhone
1) Open the Apple Watch App on your iPhone.
2) Select General 
3) Tap on Software update and there you'll see if you're running the latest version.

 

In case there is an update - make sure to install it with by clicking on Download and Install. Enter your iPhone passcode in order to proceed. It's of a highest importance that you connect your Apple Watch on its charger before downloading the update to ensure that the process will be completed. 

Updating Watch OS from the Apple Watch 
1) Open Settings on your Watch 
2) Select General
3) Tap on Software updates and the watch will check for updates - if there is available update, you'll again see the option Download and Install.

Here’s how you link your accounts and set Spotify as the default music player for Alexa:

1. Launch the Amazon Alexa app and select “More” in the bottom bar.
2. Go to “Settings” and choose “Music & Podcasts” under ALEXA PREFERENCES.
3. On top of the SERVICES list, there is a “Link New Service ⊕” option. Tap it and choose the Spotify thumbnail in the following window.
4. Then, log in to your Spotify account to proceed.
5. When you log in, a permission screen appears asking you to allow Alexa access to Spotify. Hit AGREE, and a window pops up informing you that you’ve successfully linked the accounts.
6. Now, tap CLOSE to exit this screen.
7. A new window will open, asking if you want to choose a default Music Service. Tap VISIT MUSIC SETTINGS and select Spotify as default service for music and podcasts—et voilà.

With Spotify set as your default music service you’ll have full access to your personalized content and requests for songs, artists, albums and playlists will source from Spotify. To get Alexa to play your Spotify playlist, try saying:

 

“Alexa, play [playlist name] playlist.”

 

Check out the list below for some essential controls that can be used with Alexa.

Of course, you can also use the Spotify apps on mobile and desktop devices as well as the web player through Spotify Connect to browse through Your Library and handpick your favorite tunes – you will see your speakers listed among the available devices.

Choosing music / podcasts

• “Alexa, play [title / artist / album].”
• “Alexa, play [song] by [artist] on [device / speaker group].”
• “Alexa, play [playlist].”
• “Alexa, shuffle [playlist].”
• “Alexa, play [genre].”
• "Alexa, play [podcast name]."

Playing music

• “Alexa, play.”
• “Alexa, stop.”
• “Alexa, pause.”
• “Alexa, resume the song.”
• “Alexa, stop shuffle.”
• "Alexa, louder / quieter."
• “Alexa, volume up / down.”
• “Alexa, set volume to level [number].”
• “Alexa, who is this?”
• “Alexa, what song is this?”
• "Alexa, turn this off in [minutes]."
• “Alexa, Spotify Connect.”

Alexa EQ controls

• "Alexa, set the treble to [number]."
• “Alexa, increase bass.”
• "Alexa, decrease treble.”
• “Alexa, increase bass in [speaker group].”
• "Alexa, set bass to [number] on [device].”

If you’re finding Alexa isn’t cooperating with your music requests and it’s always a random public playlist of the same name playing instead of your own, make sure you’re using the correct command.

You can check the “Voice History” under “Activity” in the Amazon Alexa app to check if she heard you correctly and leave feedback whether she did what you wanted to improve your Alexa experience.

Another important thing to note is that you must use the exact name of the playlist you want. Things that are likely to cause issues are usually playlists that contain punctuation, emojis, acronyms and initialisms (e.g. NASA and BBC) or other words that are just difficult to pronounce. The easiest way to deal with those is to rename the playlist from within Spotify.

Note that Alexa might not be able to open newly/recently created playlists, because it can take time for Alexa to refresh your library of playlists. If you want to force it to find your new playlist immediately, try unlinking your Spotify in the Alexa app and then re-linking it (as described above). This should refresh the list of available playlists.

Naturally, you can only rename the playlists you created yourself - So, what about those playlists that you’re following, whose names you cannot edit?

One way to deal with this is to make a copy of the playlist and give it an easy to pronounce name that Alexa can understand. Keep in mind that your copied playlist won’t get any new songs added to the original, followed playlist, so we know this isn’t ideal.

You can also try to create an Alexa Routine that triggers playback of the desired playlist.

Once you have your routine set up, you can simply say: “Alexa, playlist.” and the favorite one will start automatically. Of course, you can always go back to the routines section and edit your preferences or have multiple routines for different playlists.

Yes! Use Spotify Free and ask Alexa on your smart speaker for:

• Any artist, album or track to hear a music mix inspired by your choice
• Your personal playlists to hear a playlist radio based on your mix
• Or listening to our specially curated playlists for every genre, mood or activity!

Tune in to hundreds of personalized radio stations with favorite and up-and-coming artists 🎶

It’s currently not possible to link more than one Spotify account per Alexa account, but there’s a workaround that allows you to set up multiple Spotify accounts to work on your Alexa.

You can add multiple accounts by setting up an Amazon Household. This way you can switch from one account to another just by talking to Alexa. For more details check out the related Amazon Help Topic here.

Note that everyone who intends to use it will need to set up their own account with Amazon which in turn has to be linked to their own Spotify account using their own version of the app. 

Alternatively, you can use Spotify Connect without having to link your accounts, but if you don’t, you won’t have the full functionality of Alexa’s commands either and you'll have to use the Spotify app to choose your music.

To do this, say "Alexa, Spotify Connect" to the specific speaker you want to listen to music on and follow the instructions that Alexa gives you (Open Spotify on your phone and select the playback device from the list). This allows you to play music from separate Spotify accounts on different speakers at the same time.

Tip: It’s best to keep Spotify closed when you use the "Spotify Connect" command, then open Spotify when she tells you to. If you don't, the connection between Spotify app and your speaker isn't always made.