The error “111285: The postal code is invalid” in UPS Live Rates usually means the zip code you have entered for particular destination is not recognized as valid by UPS.
Please double-check that the entered postal code corresponds to a real and serviceable destination’s zip code according to UPS standards. It is also recommended to verify your store’s address settings and make sure all values are correctly set, as well as the shipping address used during tests. Incorrect address details, especially zip codes, can trigger this error during rate requests. If the issue persists, further review or contacting UPS support for specific information about the postal code may be necessary.