'Prompt the user' not working in Template Variable?

When creating a Template Variable for use in a Template routine, one option is to set the variable type as 'Prompt the user', which is supposed to open a dialog box.  I can't for the life of me get this to do anything.

The Template Card has a text field linked to a Card Variable

The Card Variable is 'copied' to the corresponding Template Variable in the Template

The corresponding Template Variable is set to type 'Prompt the user'

That seems to be what I need to do and yet when I run the Template, no dialog box ever appears.  As usual the barely minimal help file is useless in this regard.

Anybody got this feature working?  Care to tell me what I'm missing?

Thx.

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