Reject function in onCustomValidation event not working

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Hello Dani :raised_hand_with_fingers_splayed:

I can’t spot an issue, let’s debug the code, log the returned result in the Frontend , also, log the status on the Backend before returning it.

In the Frontend code, try to use async/await on the custom validation function and the validarIBAN() function since it returns a promise.

$w('#iban').onCustomValidation(async(iban,reject) => {
    await validarIBAN(iban)
})

Try these suggestions.