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Activity Reminder Popup Window will not fire if the user only has a Visualforce page open in their browser

Knowledge Article Number 000232239
Description Customer might encounter the following behavior:
  • An end user has a browser session with only Visualforce tabs open (*
  • There are no regular Salesforce Classic UI tabs open (* in the browser session
  • The Activity Reminder Popup Window does not appear
  • If the user opens up a developer console in the web browser, they may see an error like, “XMLHttpRequest cannot load No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin '' is therefore not allowed access."
Resolution This is actually working as design. The behaviors listed above are to be expected.

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