This error typically occurs when the sender's (origin) state or province field is either left blank, spelled out fully instead of using the required two-letter ISO abbreviation (e.g., writing "California" instead of "CA"), or contains formatting characters mismatched with the carrier's system.
To fix it, go to your shipping platform's sender profile or carrier integration settings, ensure the state/province code for the "Ship From" address uses the correct standard abbreviation, and try generating the RMA waybill again.
