SQL Sub query returns more than one value error

What is the issue with insert query below?

I’m trying to insert employee values from one table to another table. But the query gives an error:

Subquery returned more than 1 value. This is not permitted when the subquery follows =, !=, <, <= , >, >= or when the subquery is used as an expression.

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DECLARE @EmployeeDetails AS [dbo].[Employee] 
 
INSERT INTO @EmployeeDetails
VALUES ( 101
       )
INSERT INTO @EmployeeDetails
VALUES ( 102
       )

INSERT INTO [dbo].[EmpCopy] (EmpId, Dept)) 
values (
(SELECT EmpId FROM @EmployeeDetails)
,'Sales')

>Solution :

You don’t have to specify the values if you want to insert all the data from another table

The correct syntax is:

INSERT INTO [dbo].[EmpCopy] (EmpId, Dept)
SELECT EmpId, 'Sales'
FROM @EmployeeDetails