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If you've accidentally removed an appx using the WVD optimization tool and MS Store doesn't work for you follow this:

1. Go here to get the appx bundle.  https://store.rg-adguard.net/
   1. This site exposes the appxbundle and dependencies of MS Store apps. 
2. Input the URL of the MS Store Appx into the search.
3. You can get the Store URL from the AppxPackages.json file from the WVD Optimization Configuration Files folder.
4. For example- Groove is:
   1. "AppxPackage": "Microsoft.ZuneMusic",
   2.     "VDIState": "Disabled",
   3.     "URL": "https://www.microsoft.com/en-us/p/groove-music/9wzdncrfj3pt
5.  

Example and will look like this:

Download a recent .appxbundle. you only need the most recent.

It shows the dependencies but most likely the are already on the WVD so start with appxbundle

It will download as a long guid.  Copy the name/url from the site on the left and rename the downloaded guid to the url name:

Run powershell with admin credentials and run DISM:

DISM.EXE /Online /Add-ProvisionedAppxPackage /PackagePath:c\temp\Microsoft.ZuneMusic_2019.18052.11112.0_neutral_~_8wekyb3d8bbwe.appxbundle /SkipLicense

Warning: if you run just add-appxpackage it won’t install for all users.