Workbooks with Variable name

I am unable to work with Workbooks which name is based on a Variable

Sub test2()
Dim MyFile As String
MyFile = "Justin Dashboard 2019"
Workbooks(MyFile).Active
End Sub

This gives me the error "Object doesn't support this property or method"

Of course I need a dynamic variable which will be changed based on other variables etc... in the future.
but for now, I am not even able to go further unless I put

Workbooks("Justin Dashboard 2019").Active

just without a variable.
This is blocking my work

Any help would be of big help!
Thank you in advance

Giorgio

Thanks for correcting. This has proven that the variable works and that I have mistaken in other properties and functions.
Whish is leading me to a solution
Thanks for helping!