How to update Application's property use Microsoft Graph REST API ?

[Fisher (FisherMS)]

var app = AzClient.GraphClient.Applications[objectId];
app.Web.ImplicitGrantSettings.EnableAccessTokenIssuance = ap.EnableAccessTokenIssuance;
app.Web.ImplicitGrantSettings.EnableIdTokenIssuance = ap.EnableIdTokenIssuance;

 await  AzClient.GraphClient.Applications[objectId].PatchAsync(app);

When I execute up codes ,then get a throw exception.

Microsoft.Graph.Models.ODataErrors.ODataError: New password credentials must be generated using service actions.
   at Microsoft.Kiota.Http.HttpClientLibrary.HttpClientRequestAdapter.ThrowIfFailedResponseAsync(HttpResponseMessage response, Dictionary`2 errorMapping, Activity activityForAttributes, CancellationToken cancellationToken)
   at Microsoft.Kiota.Http.HttpClientLibrary.HttpClientRequestAdapter.SendAsync[ModelType](RequestInformation requestInfo, ParsableFactory`1 factory, Dictionary`2 errorMapping, CancellationToken cancellationToken)
   at Microsoft.Kiota.Http.HttpClientLibrary.HttpClientRequestAdapter.SendAsync[ModelType](RequestInformation requestInfo, ParsableFactory`1 factory, Dictionary`2 errorMapping, CancellationToken cancellationToken)
   at Microsoft.Graph.Applications.Item.ApplicationItemRequestBuilder.PatchAsync(Application body, Action`1 requestConfiguration, CancellationToken cancellationToken)
   at Aicro.AzureDeploy.Services.AzureApplicationService.UpdateAsync(Application app) in W:\Aicrosoft\ProjectTemplates\AzDeploy\AzDeploy.Core\Aicro\AzureDeploy\Services\AzureApplicationService.cs:line 102

How to update the Application's Properties?