Some error responses include a code that is a brief description of the error. See all of the error codes below with a detailed description of each.

UNPROCESSABLE_RETURNThe return cannot be processed because it is in a state that keeps it from being processed. Check the state of the return and make sure it is eligible for processing.
UNPROCESSABLE_FLAGGED_RETURNUnless enabled, flagged returns cannot be processed. If you would like to configure your flagged returns to process, please adjust the "Allow flagged returns to process" setting in your Loop Admin.