How to register a customer name with Google?

Question

I have two applications that access my users' calendars through a service account. Until today, everything worked fine, and suddenly one of the applications cannot receive a grant token. I read that this may be due to the fact that the same service account is used at the same time (which was during the year, but it doesn’t matter), so I decided

• create a second service account
• and allow him access to calendars

I created a service account in the Google Developers Console -> API Manager -> Credentials.

Now the console looks like this:

Service account client 1 is the original service account that worked for both applications, and now works only for one of them. The ga... account is newly created.

To get the ClientID, I went (on the same page) to "Manage Service Accounts" and I get the following:

A newly created account does not provide the ability to verify your ClientID. Why?

ClientID is also available in the JSON file loaded at creation. I extracted it from there and tried to allow access in my GApps security console:

As you can see, it was denied.

What part did I skip when creating this second account?

Answer 1

Found:

and after checking the checkbox below both accounts look the same, ClientID is available, and it can be enabled in the GApps console.