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You have USPS shipping methods that are not configured for the REST API
For the error message indicating that “You have USPS shipping methods that are not configured for the REST API,” this typically means that the shipping methods within your plugin settings need to be updated to match the new REST API configuration. You can find more details about explanation of REST API settings here.
Each of these components—Type, Sub-Type, Shape, and Delivery Type—works together to create a detailed descriptor (SKU) that maps directly to the appropriate pricing and service level for a given USPS mailing product. This system ensures that every factor, from the physical shape of the item to the special delivery conditions, is accounted for in the postage calculation.