Hi,
We followed up with Canada Post and below is the reply we received. You may want to make note of the contact information for anyone else experiencing this problem.
Thanks!
You are attempting to use a solution powered by Sell Online, an older shipping solution no longer in active development and is not supported on the Developer Program forum. For any Sell Online Inquiries please contact 1 866-511-0546 or email at
This email address is being protected from spambots. You need JavaScript enabled to view it.
We highly recommend you to use a solution based on the Developer Program APIs if possible.
Many thanks,
The Developer Program team