Cannot run SQL Agent Analysis service command against server alias

Question

Hi,

I seem to have everything working except running a SSAS Tabular cube refresh from SQL server based on a ALIAS name.

SQL Server 2019, DNS & SQL Server alias configured to use CubesDEV alias.

First test, connected with SSMS support SupportDEV to the analysis services CubesDev. This works fine.
Manual refresh started from SSMS. This works fine
Created a credential and proxy to use as the run as in a SQL server Analysis Services Command
Added credential user to Server Administrators role (I now high level but is for testing now)
Created a SQL Server Analysis Services Command job step to refresh database

{
  "refresh": {
    "type": "automatic",
    "objects": [
      {
        "database": "C"
      }
    ]
  }
}

Used real servername SRV001
Started job, works fine
Changed job step to use server alias CubesDEV do get error:

User's image

And more like this text.

The basic question is: Why can I connect to the SSAS Tabular instance based on real and alias server name with SSMS and run the proces cube. Can I also do this in a SQL agent job based on the real server name but not based on the server Alias?

Regards,

Arjan