Keycloak email invalid for an existing user due to non-ASCII characters

Hi all,
I am trying to find the best approach for an existing user that we have in the database. A custom provider has been created, without overriding the validity of the email address.

This user has non ASCII characters in its email address. Keycloak (version 21.1.2) evaluates the email address as invalid. The issue here is that the user is an external partner so there is no option to communicate that he/she should change his/her email address.

Is there any configuration for the email address format support, or how can i by pass it?

Thank you in advance.