If I want to return custom error from Rules I simply do callback(new UnauthorizedError('Custom error message here')) but how do I do the same thing with Hooks? callback('error message'); callback(new Error('error message')); Those didn’t worked and UnauthorizedError is undefined in Hooks. Whatever…

Just wanted to let anyone finding this thread now that it is now possible to propagate an error message from the pre-registration-hook (but only in the new universal login): https://auth0.com/docs/hooks/extensibility-points/pre-user-registration#sample-script-customize-the-error-message-and-language…

How to return error from Auth0 hooks

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Surface Hook exception messages to lock or hosted login page Help lock , hooks , hosted-login-page , universal-login	2	3832	September 4, 2019
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How to return error from Auth0 hooks

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