How to customize the error message when siup up an email which already exists?

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Hi @nicky.tseng ,

Welcome to the Auth0 Community!

We can customize the error message in the signup page with the Auth0 Management API endpoint

PUT https://{your domain}/api/v2/prompts/signup/custom-text/en

{
    "signup":{
        "auth0-users-validation":"your customized error message"
    }
}

This is how it looks after sending the request.

image
image770×824 60.7 KB

Reference:

Hope this helps!

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