GraphFacade.cs

using System;
using System.Threading.Tasks;
using Microsoft.Graph;

namespace < YOURNAMESPACE > {
	public interface IGrapFacade {
		Task < IGraphServiceUsersCollectionPage > GetUsersUsingGraph(Guid tenantId);
	}

	public class GraphFacade: IGrapFacade {
		private readonly IGraphAuthService _graphAuthService;
		public GraphFacade(IGraphAuthService graphAuthService) {
			_graphAuthService = graphAuthService;
		}
		public async Task < IGraphServiceUsersCollectionPage > GetUsersUsingGraph(Guid tenantId) {
			var graphClient = _graphAuthService.GetGraphServiceClient(tenantId);
			var users = await graphClient.Users.Request().GetAsync();
			return users;
		}
	}
}