Created an Okta integration app. Implemented code in .netcore 5.0 to extract the token and authorized the token on the basis of cid and scope.

Created a custom middleware where I am reading the token, decrypting the token and validating the token but I am getting a error:

System.InvalidOperationException: No authenticationScheme was specified, and there was no DefaultChallengeScheme found. The default schemes can be set using either AddAuthentication(string defaultScheme) or AddAuthentication(Action<AuthenticationOptions> configureOptions).

  at Microsoft.AspNetCore.Authentication.AuthenticationService.ChallengeAsync(HttpContext context, String scheme, AuthenticationProperties properties)

  at Microsoft.AspNetCore.Authorization.Policy.AuthorizationMiddlewareResultHandler.HandleAsync(RequestDelegate next, HttpContext context, AuthorizationPolicy policy, PolicyAuthorizationResult authorizeResult)

  at Microsoft.AspNetCore.Authorization.AuthorizationMiddleware.Invoke(HttpContext context)

  at Microsoft.AspNetCore.Authentication.AuthenticationMiddleware.Invoke(HttpContext context)

  at RDS.Web.API.Middlewares.CustomAuthenticationMiddleware.InvokeAsync(HttpContext httpContext) in C:\Users\vipul.aggarwal\Source\Repos\core-backend\RDS.Web.API\Middlewares\CustomAuthenticationMiddleware.cs:line 47

  at Swashbuckle.AspNetCore.SwaggerUI.SwaggerUIMiddleware.Invoke(HttpContext httpContext)

  at Swashbuckle.AspNetCore.Swagger.SwaggerMiddleware.Invoke(HttpContext httpContext, ISwaggerProvider swaggerProvider)

  at Microsoft.AspNetCore.Diagnostics.DeveloperExceptionPageMiddleware.Invoke(HttpContext context)

Could anyone help me out with this or anyone can provide any code reference document.