Your snippet needs to be installed on all relevant pages in order to display any type of notification.
For example, if you have configured a notification to display on, make sure your snippet is installed on that page.

Use one of the two testing methods described below:

ProveSource Debug Tool

Use Browser Console

Open your browser's console by hitting the Ctrl+Shift+J (or Cmd+Shift+J on a Mac) and find the ProveSource debug lines:

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