The Register button can be enabled in the Keycloak Administration Console in the Realm Settings menu.
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Open the Keycloak Administration Console.
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In the Configure section, click Realm Settings.
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Switch to the Login tab.
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Set the value of the User registration slider to ON.
The Email as username slider will appear. -
If the email used for registration is to be used as the username, set the value of the Email as username slider to ON.
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Click Save.