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stamps.com is installed but does not connect M2

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stamps.com is installed but does not connect M2

I installed stamps.com extension and it shows as SDS in configuration. it has some fields to select asSmiley Tonguerice Export Type
Import Discounts
Export custom attributes as custom options
Import Child Product

 

in other words their extension is installed in magento 2 so why when I try to connect it to be able to manage the shipping from their system is just does not connect? i fill this information correctly and it just does not connect.

ANY ideas?

 

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