title: "InvalidOperationException: IDX20803: Unable to obtain configuration from: '[PII is hidden]'"
body: <p>I've deployed my API and Client app on Docker, but for the life of me, the web app cannot call the API, I keep getting an exception.</p>
  <p>I added the following line suggested in other posts, but it did not work.</p>
  <pre><code>IdentityModelEventSource.ShowPII = true;
  </code></pre>
  <p>Exception:</p>
  <pre><code>System.InvalidOperationException: IDX20803: Unable to obtain configuration from: '[PII is hidden]'.
  at Microsoft.IdentityModel.Protocols.ConfigurationManager`1.GetConfigurationAsync(CancellationToken cancel)
  at Microsoft.AspNetCore.Authentication.JwtBearer.JwtBearerHandler.HandleAuthenticateAsync()
  at Microsoft.AspNetCore.Authentication.JwtBearer.JwtBearerHandler.HandleAuthenticateAsync()
  at Microsoft.AspNetCore.Authentication.AuthenticationHandler`1.AuthenticateAsync()
  at Microsoft.AspNetCore.Authentication.AuthenticationService.AuthenticateAsync(HttpContext context, String scheme)
  at IdentityServer4.AccessTokenValidation.IdentityServerAuthenticationHandler.HandleAuthenticateAsync()
  at Microsoft.AspNetCore.Authentication.AuthenticationHandler`1.AuthenticateAsync()
  at Microsoft.AspNetCore.Authentication.AuthenticationService.AuthenticateAsync(HttpContext context, String scheme)
  at Microsoft.AspNetCore.Authentication.AuthenticationMiddleware.Invoke(HttpContext context)
  at Microsoft.AspNetCore.StaticFiles.StaticFileMiddleware.Invoke(HttpContext context)
  at Microsoft.AspNetCore.Cors.Infrastructure.CorsMiddleware.InvokeCore(HttpContext context)
  at Microsoft.AspNetCore.Diagnostics.DeveloperExceptionPageMiddleware.Invoke(HttpContext context)
  </code></pre>