Using a service account to use power bi api

Hello,

I am using a service account to run Power BI APIs.

When I use APIs like GET-PowerBI Workspace here no success it returns the workspace of which it is admin.

However, when I use it with Invoke-PowerBIRestMethod APIs I get this error message:

 Invoke-PowerBIRestMethod : Une ou plusieurs erreurs se sont produites.
Au caractère Ligne:26 : 1
+ Invoke-PowerBIRestMethod -Url "https://api.powerbi.com/v1.0/myorg/pip ...
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : WriteError: (Microsoft.Power...werBIRestMethod:InvokePowerBIRestMethod) [Invoke-PowerBIRestMethod], AggregateException
    + FullyQualifiedErrorId : Une ou plusieurs erreurs se sont produites.,Microsoft.PowerBI.Commands.Profile.InvokePowerBIRestMethod
 
Invoke-PowerBIRestMethod : Encountered errors when invoking the command: {
  "code": "PowerBINotAuthorizedException",
  "pbi.error": {
    "code": "PowerBINotAuthorizedException",
    "parameters": {},
    "details": [],
    "exceptionCulprit": 1
  }
}
Au caractère Ligne:26 : 1
+ Invoke-PowerBIRestMethod -Url "https://api.powerbi.com/v1.0/myorg/pip ...
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : WriteError: (Microsoft.Power...werBIRestMethod:InvokePowerBIRestMethod) [Invoke-PowerBIRestMethod], Exception
    + FullyQualifiedErrorId : Encountered errors when invoking the command: {
  "code": "PowerBINotAuthorizedException",
  "pbi.error": {
    "code": "PowerBINotAuthorizedException",
    "parameters": {},
    "details": [],
    "exceptionCulprit": 1
  }
},Microsoft.PowerBI.Commands.Profile.InvokePowerBIRestMethod

For info the service account has a PowerBI PRO license.

Does anyone have a solution?

Thanks in advance, 

Charline