Server not available on Parse Server Dashboard

I've setup Parse Server Dashboard on my local machine, and followed the instructions to connect to my Parse Server which is hosted on Heroku.

The Server URL I use to connect to Heroku in my iOS is:

https://my-app-name.herokuapp.com/parse

, so I used this for the Dashboard also.

My config settings are:

{
  "apps": [
    {
      "serverURL": "https://my-app-name.herokuapp.com/parse",
      "appId": "appId",
      "masterKey": "masterKey",
      "appName": "appName"
    }
  ]
}

, however I am getting the error "Server not reachable. Could not connect to server".

When I remove the https://, I get the error "Server not reachable. Server version too low."

The version is 2.1.4, which is the minimum requirement for the Dashboard.

Any suggestions please?

Thanks!