Hello,
Try re-registering Cortana. Perform these steps:
1. Open Windows PowerShell as administrator.
2. Then type following command and press Enter key:
Get-AppXPackage -Name Microsoft.Windows.Cortana | Foreach {Add-AppxPackage -DisableDevelopmentMode -Register "$($_.InstallLocation)\AppXManifest.xml"}
Let the command complete.
3. Close Windows PowerShell and see if the issue is resolved now.
Reference: https://www.kapilarya.com/how-to-reinstall-or-re-register-cortana-in-windows-10
Let us know if this helps!
Note: Included link in this reply refers to blog post by a trusted Microsoft MVP.