I have tried printing a Amazon Buy Shipping label and am seeing an error returned:

Cannot generate shipping label using Amazon Buy Shipping Service. Order doesn't appear to have come from this integrated Amazon account. Order Subsource xxxxx1, expected Subsource xxxxxx2


This error is being returned because the Amazon Buy Shipping integration is configured for the Amazon account that the order is downloaded from. Please check if the order's Subsource is from another account and if it is, then use the correct Amazon Buy Shipping integration or make an additional integration if necessary.

Account that is linked with the Amazon Buy Shipping integration can be checked in > Shipping > Integrations > Config > Account Name

Related articles:

Amazon Buy Shipping - Add new Integration

Shipping - Amazon Buy Shipping: how to set up