I've created a test Enterprise Integration app and did set the application access to Enterprise. Now on the admin console, when I tried to try to add the API Key ID of this application to list of the custom applications, I get the following error
Unable to retrieve service or enterprise app authorization [1]
If I use the this app configuration settings to generate a token I get this error The API returned an error code [400] unauthorized_client - This app is not authorized by the enterprise admin [2]
Which means that I have to authorize this app!!
What does this first error [1] means? and what did I misconfigured?