What date did NACHA update their return codes last?

New or repurposed codes? Not sure if this was the last one.

April 1, 2020 – Differentiating Unauthorized Return Reasons – Beginning on the effective date, RDFIs may begin to use return reason code R11 for a debit for which there is an error, but for which there is an authorization. This differentiates R11 returns from those using R10, which will still mean that a consumer claims a debit was not authorized.