[Bug] Web App call local API cause IDX10214: Audience validation failed. #559

// inside of Startup.cs -> ConfigureService
services.AddMicrosoftIdentityWebAppAuthentication(Configuration)
            .EnableTokenAcquisitionToCallDownstreamApi(new string[] { Configuration["Scope"] })
            .AddInMemoryTokenCaches();
// inside of Controller call
var token = await _tokenAcquisition.GetAccessTokenForUserAsync(_Scopes);
HttpClient.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Bearer", token);
HttpClient.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));
var response = await HttpClient.GetAsync(requestUrl, HttpCompletionOption.ResponseHeadersRead);
// response is 401 Not authorized
Expected behavior

Response 200 OK with the data I need
Actual behavior

I have the Web API in a project, published on Azure and the Web APP in a different project.

If I debug the APP and call an endpoint of the APIs I receive the 401 error.

In the debug output of the Web API I see the error message:
Bearer was not authenticated. Failure message: IDX10214: Audience validation failed. Audiences: '92e3d039-XXXX-XXXX-XXXX-6e360645ca06'. Did not match: validationParameters.ValidAudience: 'api://92e3d039-XXXX-XXXX-XXXX-6e360645ca06' or validationParameters.ValidAudiences: 'null'.
The only difference is that "api://" token.




    

Do you know what I am missing and why it works with the published APIs but not with the local ones?