Please go to your MAC System Preferences -> Security & Privacy -> Privacy -> Automation and set the checkmarks for Xink as shown in the image example below.
If the above options do not show, please perform the following steps below.
- Quit Xink.app if it is running.
- Run the following command from a Terminal: tccutil reset AppleEvents
- Start Xink.app from the Applications folder.
- Click the Xink menu and choose "Preferences". Make sure that Outlook is chosen. Close the dialog.
- Click "Update signatures".
Hopefully, macOS will now show you this prompt where you must click "Ok":