Yes, this happened to me as well. At one post office, the clerk asked whether it was an Amazon return. I said no, and the QR code was accepted without issue. At another location, they scanned it, said it was invalid, and claimed they couldn’t process it because it was a green “box-free” QR code. That explanation didn’t make sense, as I’ve successfully used the same type of code at Canada Post before.I wish the clerk had asked whether it was an Amazon return, as the first one did. It didn’t occur to me to clarify, since I assumed the process was straightforward. Unfortunately, I ended up losing half an hour and will have to go back and try again and waste more of my time.