Hi everyone,

I’m hoping someone from the Amazon team or another experienced seller can help.

We’ve been experiencing a serious issue with UPS not working through Amazon Buy Shipping on ShipStation. We recently added a new UPS carrier account to Amazon and set it up as part of our Buy Shipping options. Everything appears fine on Amazon Seller Central — we can successfully buy UPS labels there.

However, in ShipStation, whenever we try to purchase a UPS label via Amazon Buy Shipping, we get the following error:

Requested shipping service was not in the list of eligible shipping services returned by Amazon for this order. (Generic). (400, d29c1a34-8868-4d03-ba61-8567bb6fb01e)

We’ve already:

• Spoken directly with ShipStation’s head of support, who confirmed the issue is coming from Amazon’s end, not theirs.

• Tried removing and reauthorizing UPS in Amazon Buy Shipping settings.

• Attempted toggling the UPS terms & conditions off and back on.

• Verified that other carriers (FedEx, USPS) work fine in Amazon Buy Shipping through ShipStation.

• Confirmed that our Amazon Buy Shipping permissions and API access are still active.

Does anyone please have a fix!!!!