Amazon FBA Canada Refusing My Shipments

I’ve been an Amazon Seller for over 10 years, and we regularly ship a significant amount of our products to Amazon FBA in Canada. On average, we send out four boxes each day to Canada. This month, however, something unusual is happening: nearly 50% of my shipments are being refused by the warehouse.

Initially, I thought it was a problem with UPS, but after escalating the issue with them, it became clear that UPS is not at fault. According to UPS, the Amazon warehouse is refusing to accept the shipments, with the boxes being marked as “receiver did not order, refused.”

I have complied with every Amazon FBA policy: using six-sided boxes, ensuring labels are clearly visible, keeping the weight under 50 pounds, and so on. I have been shipping to Canada for years without any issues, and now I’m at a loss for what to do.

If anyone else has experienced this problem or has any advice, please help!