Syntax error returned when defining parameter for function

I am working together on Python code with another beginning coder. Now we both have Python 3.8.2 installed. He is working on MAC and I am working on windows. We both work from Visual Studio Code and have the same Python extension installed (v 2020.3.71113 (31 March 2020) ).

The problem occurs when I define the type of parameters, such as in the following code:

def printing(name: str):
    print("This is your name: " + name)

printing("Mike")

On my computer this simply returns: This is your name: Mike, as I would expect.

But on his computer it throws a SyntaxError:

File ""File location"", line 1
    def printing(name: str):
                     ^
SyntaxError: invalid syntax

Now when we change the function to def printing(name): and leave all the rest unchanged, the error does not occur.

Any ideas why this happens and how we can let his computer work with defined types of parameters?