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Can you share relevant snippets of the code you're using?

Are you sure you're targetting the same region?

hi both, thank you for coming back to me! no, i was passing the arn of the security group instead of the id... i have several other security groups and that was the only one where i made that mistake so didn't spot it for hours... thanks tho! FYI: it is very weird that the cloudtrail seem to receive this missformed user id in the payload...