New instances not added/reachable with shinyapps.io

I have the standard plan. In my account there are 11 apps. For one of the apps I want to be able to add new instances so as to allow for more connections. My current settings for that app are

  • Instance size: 3X-Large
  • Max Worker Processes: 2
  • Max Connections: 2
  • Worker Load Factor: 70%
  • Instance Load Factor: 5%
  • Start Count: 1

The maximum number of connections I am able to have from my local computer to the app on shinyapps.io is 4. This does not trigger an addition of an instance.

If I manually press the + sign in the "Instances" table on the "Overview" tab in the shinyapps settings page for the app, an instance is added. However, I am still only able to have 4 connections, i.e. after reaching 4 connections the instance is not started.

I then tried to manually start the instance. However, I am still only able to have 4 connections, i.e. after reaching 4 connections the second instance seems not to be possible to connect to.

Can anyone understand what is going on?

Best wishes,

Fredrik Edin