Postal code is invalid when I try to sell an item, even though I'm typing it right?

[usagimonster]

I am in Canada, our postal code format is like: A#A #A#.

I am trying to list an item for sale but every time I submit the listing, the form states that my postal code is invalid.

I have tried to type in my postal code in every way possible. Lowercase, without the space, with the space, etc., but nothing is working.

Please help.

[owlgebra]

The only thing I can think of is swapping any letter O with digit 0, if you have any, so as to follow the A#A #A# letter/number alternation format.