Canada Post "This service does not support the envelope package type"

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New Member
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I'm brand new here and trying to do my very first shipment. My products are small and light and fit in manila envelopes. But when I try to go through the shipping, it says "Canada Post:  This service does not support the envelope package type" 

 

But the "supported package types" information I found says large, flat envelopes are supported. Letter size is not. But this isn't letter size. 

 

I honestly have no idea if I'm doing something wrong, or if Canada Post actually doesn't let me do automatic shipping labels like this for manila envelopes. 

Any help for a Newbie?

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New Member
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Further info: It works fine if I use the "padded mailer" or a "box" option. But it won't let me use any size envelope at all. I can't fathom why it wouldn't let us use envelopes for shipping??

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