Request_ResourceNotFound - Azure active directory Approle Assignments

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Azure

active-directory

Hi,

I am trying to add approle assignments to existing user.This is the code I am using.The code looks fine[I have just modified the GraphApi console App].

  IPagedCollection<IApplication> applications = null;
//Get the App where I want to add the functionality    
  applications = activeDirectoryClient.Applications.Where(e => e.AppId == "APPId").ExecuteAsync().Result;
//Get the appApplication 
appObject = (Application)applications.FirstOrDefault();
AppRole appRole = new AppRole();
//Assign the first Approle to the approle   
 
 appRole = appObject.AppRoles.FirstOrDefault();
//retrived a single user  
User user = (User)retrievedUsers.First();
//Assign the approleassignments to user
 AppRoleAssignment appRoles = new AppRoleAssignment();        
            appRoles.Id = appRole.Id;                
    appRoles.ResourceId = Guid.Parse(appObject.ObjectId);     
               appRoles.PrincipalDisplayName = appRole.DisplayName;        
            appRoles.ResourceDisplayName = appRole.DisplayName;            
        appRoles.PrincipalType = "User";               
     appRoles.PrincipalId = Guid.Parse(user.ObjectId); 
                   user.AppRoleAssignments.Add(appRoles);   
                 user.UpdateAsync().Wait();

But when I ran It is giving me the error "Request_ResourceNotFound": "Resource 'Some random string' does not exist or one of its queried reference-property objects are not present."

also I am able to update other details,it works fine.I just search for the issue it seems like if some of the parameter is not found, then we will get this error.But here I am not creating anything am just assigning the values like appID,ObjectID,PrincipalID.Please help me resolve the issue.