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

[MotherByNature]

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?

[MotherByNature]

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??

[jasi]

Hello, 

I am having the exact same issue and I am wondering if you by any chance solved this issue or if you found a way around it?

Thank you 

[mariamhoda]

Did you happen to solve it?

[pagexrage]

Shopify  many of us are having the same issue - is there a reason envelopes are not supported with the Canada Post integration, and is there an app that has this feature?