failed to run the store front application in app service

[manish-nippon]

We tried to use Visual Studio to deploy the code to Azure App Service. Also configured the web.config file. But the web app currently reporting the following error message. "[ArgumentException: endpoint is not set]"
In which configure file should we set the endpoint value, and how to set it?
detailed error message:

[ArgumentException: endpoint is not set]
Microsoft.Store.PartnerCenter.Storefront.ValidationExtensions.AssertNotEmpty(String nonEmptyString, String caption) in C:\Users\Administrator\Desktop\Partner-Center-Storefront-master\src\Storefront\ValidationExtensions.cs:43
Microsoft.Store.PartnerCenter.Storefront.BusinessLogic.KeyVaultService..ctor(String endpoint) in C:\Users\Administrator\Desktop\Partner-Center-Storefront-master\src\Storefront\BusinessLogic\KeyVaultService.cs:39
Microsoft.Store.PartnerCenter.Storefront.BusinessLogic.d__65.MoveNext() in C:\Users\Administrator\Desktop\Partner-Center-Storefront-master\src\Storefront\BusinessLogic\ApplicationDomain.cs:119

[AggregateException: One or more errors occurred.]
System.Threading.Tasks.Task.ThrowIfExceptional(Boolean includeTaskCanceledExceptions) +4751668
System.Threading.Tasks.Task.Wait(Int32 millisecondsTimeout, CancellationToken cancellationToken) +14351601
Microsoft.Store.PartnerCenter.Storefront.MvcApplication.Application_Start() in C:\Users\Administrator\Desktop\Partner-Center-Storefront-master\src\Storefront\Global.asax.cs:39

[HttpException (0x80004005): One or more errors occurred.]
System.Web.HttpApplicationFactory.EnsureAppStartCalledForIntegratedMode(HttpContext context, HttpApplication app) +517
System.Web.HttpApplication.RegisterEventSubscriptionsWithIIS(IntPtr appContext, HttpContext context, MethodInfo[] handlers) +185
System.Web.HttpApplication.InitSpecial(HttpApplicationState state, MethodInfo[] handlers, IntPtr appContext, HttpContext context) +168
System.Web.HttpApplicationFactory.GetSpecialApplicationInstance(IntPtr appContext, HttpContext context) +277
System.Web.Hosting.PipelineRuntime.InitializeApplication(IntPtr appContext) +369

[HttpException (0x80004005): One or more errors occurred.]
System.Web.HttpRuntime.FirstRequestInit(HttpContext context) +532
System.Web.HttpRuntime.EnsureFirstRequestInit(HttpContext context) +111
System.Web.HttpRuntime.ProcessRequestNotificationPrivate(IIS7WorkerRequest wr, HttpContext context) +714

[manish-nippon]

HI Team ,

please reply on same