单租户Bot调用Skill遇IDX10208错误的配置咨询

我在Bot Emulator中使用单租户模式，通过App ID和密码运行Bot技能示例，起初持续遇到Unauthorized错误。查阅文档后添加以下配置解决了该错误：

{
  "OAuthUrl": "https://unitedstates.api.botframework.com",
  "ToChannelFromBotOAuthScope": "https://api.botframework.com",
  "ToChannelFromBotLoginUrlTemplate": "https://api.botframework.com",
  "PublicAzureChannel": "https://api.botframework.com",
  "ToBotFromChannelOpenIdMetadataUrl": "https://login.botframework.com/v1/.well-known/openidconfiguration",
  "ToBotFromEmulatorOpenIdMetadataUrl": "https://login.microsoftonline.com/common/v2.0/.well-known/openid-configuration",
  "ToBotFromChannelTokenIssuer": "https://api.botframework.com",
  "ToChannelFromBotLoginUrl": "https://login.microsoftonline.com/botframework.com"
}

但调用Skill时出现如下错误：

"label": "TurnError",
"valueType": "https://www.botframework.com/schemas/error",
"value": "System.Net.Http.HttpRequestException: Error invoking the skill id: 
"label": "TurnError",
"valueType": "https://www.botframework.com/schemas/error",
"value": "System.Net.Http.HttpRequestException: Error invoking the skill id: \"EchoSkillBot\" at \"http://localhost:39783/api/messages\" (status is 500). 
Microsoft.IdentityModel.Tokens.SecurityTokenInvalidAudienceException: IDX10208: Unable to validate audience. validationParameters.ValidAudience is null or whitespace and validationParameters.ValidAudiences is null.
  at Microsoft.IdentityModel.Tokens.Validators.ValidateAudience(IEnumerable1 audiences, SecurityToken securityToken, TokenValidationParameters validationParameters)
  at System.IdentityModel.Tokens.Jwt.JwtSecurityTokenHandler.ValidateTokenPayload(JwtSecurityToken jwtToken, TokenValidationParameters validationParameters)
  at System.IdentityModel.Tokens.Jwt.JwtSecurityTokenHandler.ValidateToken(String token, TokenValidationParameters validationParameters, SecurityToken& validatedToken)
  at Microsoft.Bot.Connector.Authentication.JwtTokenExtractor.ValidateTokenAsync(String jwtToken, String channelId, String[] requiredEndorsements)
  at Microsoft.Bot.Connector.Authentication.JwtTokenExtractor.GetIdentityAsync(String scheme, String parameter, String channelId, String[] requiredEndorsements)
  at Microsoft.Bot.Connector.Authentication.JwtTokenExtractor.GetIdentityAsync(String authorizationHeader, String channelId, String[] requiredEndorsements)
  at Microsoft.Bot.Connector.Authentication.ParameterizedBotFrameworkAuthentication.SkillValidation_AuthenticateChannelTokenAsync(String authHeader, String channelId, CancellationToken cancellationToken)
  at Microsoft.Bot.Connector.Authentication.ParameterizedBotFrameworkAuthentication.JwtTokenValidation_AuthenticateTokenAsync(String authHeader, String channelId, String serviceUrl, CancellationToken cancellationToken)
  at Microsoft.Bot.Connector.Authentication.ParameterizedBotFrameworkAuthentication.JwtTokenValidation_ValidateAuthHeaderAsync(String authHeader, String channelId, String serviceUrl, CancellationToken cancellationToken)
  at Microsoft.Bot.Connector.Authentication.ParameterizedBotFrameworkAuthentication.JwtTokenValidation_AuthenticateRequestAsync(Activity activity, String authHeader, CancellationToken cancellationToken)
  at Microsoft.Bot.Connector.Authentication.ParameterizedBotFrameworkAuthentication.AuthenticateRequestAsync(Activity activity, String authHeader, CancellationToken cancellationToken)
  at Microsoft.Bot.Builder.CloudAdapterBase.ProcessActivityAsync(String authHeader, Activity activity, BotCallbackHandler callback, CancellationToken cancellationToken)
  at Microsoft.Bot.Builder.Integration.AspNet.Core.CloudAdapter.ProcessAsync(HttpRequest httpRequest, HttpResponse httpResponse, IBot bot, CancellationToken cancellationToken)
  at Microsoft.BotBuilderSamples.EchoSkillBot.Controllers.BotController.PostAsync() in D:\bot\bot\80.skills-simple-bot-to-bot\EchoSkillBot\Controllers\BotController.cs:line 30
  at lambda_method4(Closure , Object )
  at Microsoft.AspNetCore.Mvc.Infrastructure.ActionMethodExecutor.AwaitableResultExecutor.Execute(IActionResultTypeMapper mapper, ObjectMethodExecutor executor, Object controller, Object[] arguments)
  at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.<InvokeActionMethodAsync>g__Logged|12_1(ControllerActionInvoker invoker)
  at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.<InvokeNextActionFilterAsync>g__Awaited|10_0(ControllerActionInvoker invoker, Task lastTask, State next, Scope scope, Object state, Boolean isCompleted)
  at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.Rethrow(ActionExecutedContextSealed context)
  at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.Next(State& next, Scope& scope, Object& state, Boolean& isCompleted)
  at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.<InvokeInnerFilterAsync>g__Awaited|13_0(ControllerActionInvoker invoker, Task lastTask, State next, Scope scope, Object state, Boolean isCompleted)
  at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.<InvokeFilterPipelineAsync>g__Awaited|20_0(ResourceInvoker invoker, Task lastTask, State next, Scope scope, Object state, Boolean isCompleted)
  at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.<InvokeAsync>g__Logged|17_1(ResourceInvoker invoker)
  at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.<InvokeAsync>g__Logged|17_1(ResourceInvoker invoker)
  at Microsoft.AspNetCore.Routing.EndpointMiddleware.<Invoke>g__AwaitRequestTask|6_0(Endpoint endpoint, Task requestTask, ILogger logger)
  at Microsoft.AspNetCore.Authorization.AuthorizationMiddleware.Invoke(HttpContext context)
  at Microsoft.AspNetCore.Diagnostics.DeveloperExceptionPageMiddleware.Invoke(HttpContext context)

我不清楚此处的有效受众配置具体指什么，现咨询两个问题：

• 如何确保配置正确使用单租户模式，无需启用应用授权中的多租户支持？
• 需要提供哪些有效受众，以及可在何处配置这些受众？

内容的提问来源于stack exchange，提问作者Sam