CustomWorkflowDynamics365.cs

 public class WF : CodeActivity
    {
        [RequiredArgument]
        [Input("Code")]
        public InArgument<string> Code { get; set; }

        [Output("Custom Team")]
        [ReferenceTarget("team")]
        public OutArgument<EntityReference> CustomTeam { get; set; }

        protected override void Execute(CodeActivityContext context)
        {
            var workflowContext = context.GetExtension<IWorkflowContext>();
            var serviceFactory = context.GetExtension<IOrganizationServiceFactory>();
            var orgService = serviceFactory.CreateOrganizationService(workflowContext.UserId);
            var tracingService = context.GetExtension<ITracingService>();

            try
            {
                CustomTeam.Set(context, GetCustomTeamForCode(orgService, tracingService, Code.Get(context)));
            }
            catch (Exception ex)
            {
                tracingService.Trace(ex.Message);
                throw;
            }
        }
}