Hello @ernestognw ,
It slipped my mind to mention that this topic my be related to this one I opened a few days ago.
In summary, I think this error is only impacting to relayers created through the relayer client due to an issue in the secretKey creation in the create-key-endpoint, not through the Defender website.
As you already pointed out, no issue shows up when doing this relayer management from the Defender website.
Best regards,
Pedro Reyes.