May I ask if you have all four of the possibilities for Amazon to do this (link, SAS) tightly locked down to your Enterpriseās preference, rather than Amazonās*?
For the past few years, a good deal of evidence has surfaced that it is quite possible that if those particular hatches arenāt recognized by the Amabots as being tightly battened-down, problems ensue when one of Amazonās far-flung Regional Marketplace teams decides that carte blanche has been granted - rightly or wrongly.
*
Which settings, sadly, are all-too often found with the Amazon-prescribed attribute that the default is āEnabledā - without oneās own input on the actual desirability of that, from a 3P Seller or 1P Vendorās POV, dammitā¦