Power BI REST API Authentication with Postman

Hi roxane_cz ,

Please review the solution in the following links, hope they can help you resolve the problem.

REST API Silent Authentication (Token)

The user or administrator has not consented to use the application

Best Regards

Did u managed to resolve this issue ?

If you are using C#, the request to get access token would be as following:

var clientHandler = new HttpClientHandler
{
    UseCookies = false,
};
var client = new HttpClient(clientHandler);
var request = new HttpRequestMessage
{
    Method = HttpMethod.Get,
    RequestUri = new Uri("https://login.microsoftonline.com/<your_tenant_id>/oauth2/v2.0/token"),
    Content = new FormUrlEncodedContent(new Dictionary<string, string>
    {
        { "client_id", "<your_client_id>" },
        { "scope", "https://analysis.windows.net/powerbi/api/.default" },
        { "client_secret", "<your_client_secret>" },
        { "grant_type", "client_credentials" },
    }),
};
using (var response = await client.SendAsync(request))
{
    response.EnsureSuccessStatusCode();
    var body = await response.Content.ReadAsStringAsync();
    Console.WriteLine(body);
}

To get more details, see: https://kalcancode.wordpress.com/2025/02/18/powerbiclient-how-to-get-access-token/