1. Package Microsoft.LanguageExperiencePackit-IT_19041.3.7.0_neutral__8wekyb3d8bbwe was installed for a user, but not provisioned for all users. This package will not function properly in the sysprep image.
2. SYSPRP Failed to remove staged package Microsoft.LanguageExperiencePackit-IT_19041.49.150.0_neutral__8wekyb3d8bbwe. Failed to remove apps for the current user.
To fix this kind of errors, mainly found in Azure Virtual Desktop implementations with custom languages, you must manually delete the app that was provisioned just for your current user, and that is crashing your sysprep attempts.
To fix the issue, take a snapshot of the client, then remove the provisioned app package:
Remove-AppxProvisionedPackage -Online -PackageName Microsoft.LanguageExperiencePackit-IT_19041.3.7.0_neutral__8wekyb3d8bbwe
Whatever output you get, complete the removal of the app using the following command:
Remove-AppxPackage -allusers Microsoft.XboxApp_31.32.16002.0_neutral_~_8wekyb3d8bbwe
You should now be able to sysprep the VM without issues.