I can not get result for external shipping for Canada and other countries

Hello support team,
I want to test easyship API. But I have problem for getting "Request rates and taxes" response . I am trying to send request using sandbox access token on your page https://developers.easyship.com/reference#request-rates-and-taxes . I am getting results for US destination. But when I am trying to get calculation for Greit Britain or for Canada - I am getting any results.. Here is my request https://prnt.sc/u4f30x and I am getting such response https://prnt.sc/u4f3f6 . So, I can get any response for extenal shipping. can you please help me, what am I doing wrong?

{"origin_postal_code":"059405","destination_country_alpha2":"CA","destination_postal_code":"M2M1W1","taxes_duties_paid_by":"Receiver","is_insured":false,"items":[{"quantity":"1","actual_weight":1,"height":30,"width":20,"length":30,"category":"fashion","declared_currency":"USD"}],"apply_shipping_rules":true,"destination_city":"Vaughan","destination_state":"ON"}