When consumer Google+ shuts down on April 2nd, consumer users running a Hangout on Air or Hangout video call from Google Calendar will almost certainly lose access to third party apps like Hangouts Toolbox and Control Room. It is not clear whether G Suite accounts will still have access to these apps. While there currently isn't any notice inside the Hangout on Air interface, I've personally confirmed that deletion of the Google+ Profile on an account makes the apps disappear and the option to add new apps is removed.. In April 2017 Google stopped supporting the Google+ Hangouts API . This removed most Hangouts video call apps, leaving only a few business and Hangout on Air-related apps running. From the Google+ Hangouts API FAQ, regarding changes on April 25, 2017 Since 2015, these apps have only been available in Hangouts video calls launched from Google Calendar events or Hangouts on Air live broadcasts. And - notably - they require a Google+ Profile or Google
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