Hello @Seller_hJdM92O55ePVb I see that you also also monitoring the forums thread:

Amazon Buy Shipping Broken - All Orders "AT RISK"

Amazon recently adjusted USPS transit times. This included longer delivery times for USPS Ground Advantage shipments, which have been called out by sellers in this and related threads.

If you manage your own handling/transit times, keep in mind that transit times were adjusted to account for packages taking longer to deliver, and check that your settings to account for this.

For sellers using Shipping Settings Automation: I have shared reports with our partner team of SSA-calculated services not being protected in Buy Shipping. Please check your more recent orders and those over the next few days and let me know if you continue to see USPS GA (or other services?) showing as unprotected.

In the meantime, I have raised this issue to our partner team. If you receive an order where the shipping service used to set the delivery promise does not show as protected, you have the option to use that service although it will not be Claims/OTDR Protected. If you do use an unprotected service and experience issues, you can raise the issue to support and to the forums, and I can attempt to escalate the appeal request.