Hello, I'm Louie, and I'm happy to help you today. Hope you're doing well and safe there. I'm sorry that you're having trouble with your App.
First thing to do is to try signing out and then signing right back in and see if that helps. But make sure you're signed in to the right account where you purchased the game.
If the step above didn't work you may proceed with the solutions below.
Solution 1 - Run Windows App Troubleshooter:
Windows Key+X > Click Settings > Click Update & security > Click Troubleshoot > Scroll down to the bottom > Click Windows Store Apps > Click Run the Troubleshooter
Solution 2 - Try to Reset or Repair the app
Go to Windows Settings > Apps > Apps & Features > [Name of App] > Advanced Options > Reset or Repair. Restart PC.
Solution 3 - Reset Windows Store through Command Prompt
Type cmd in Windows Search box > Right click on Command Prompt > Run As Administrator > Type WSreset.exe and click Enter > Reboot your computer
Solution 4 - Re-register All Store apps (If get many Reds, you can just ignore it)
Windows Key+X > Windows Powershell (Admin) > Copy the following from below and right click in Powershell to paste > Enter > Restart your computer
Get-AppXPackage -AllUsers | Foreach {Add-AppxPackage -DisableDevelopmentMode -Register "$($_.InstallLocation)\AppXManifest.xml"}
Hope this helps and looking forward for good results.
Kind regards,
Louie