Error and error_description in the callback

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Hello @andries.neyens,

Welcome to the Auth0 community!

When an user is blocked from the dashboard, the message is returned in the URL to the application’s callback endpoint.

Please check the following Knowledge solution that delves deeper into the issue and should help you with your situation: How to Customize Error Message Returned to Application Callback Endpoint

I hope this helped you and if you have more questions please return to the community.

Thanks,
Tudor