Regarding Canada Post Strike, found "If we have not generated your shipment for you yet, it is time to switch to our alternative vendor BLS or consider upgrading to Premium Delivery Service to receive your documents to an address in Canada." on AIS https://ais.usvisa-info.com/en-ca/niv/information/announcements#898-canada_post_nationwide_strike_in_effect_20241115155432
May help someone looking to change the location