Hi,
Thank you for the response.
The OnAfterActionEvent didn't work, but the the OnBeforeActionEvent worked.
I can use this to trigger my code.
The problem with this way of triggering my code is, that I have no way to check if the uninstalled App/Extension is mine.
If I use the "Published Application"-Parameter I get an error: "The application object or method 'Published Application' has scope 'OnPrem' and cannot be used for 'Extension' development".
I can't switch my Environment to an OnPrem-Environment.
Do you know any other way how I can check if the uninstalled app is my app?