The VA/VE6 QSL Bureau uses ISED’s database to check mailing addresses. It is your responsibility to keep their database up to date. Legally, you have 30 days to provide them with your new mailing address.
Have you moved?
To change your address, contact the Amateur Radio Service Centre and request a change of address form. https://www.ic.gc.ca/eic/site/025.nsf/eng/h_00010.html