[keycloak-user] Refill custom attributes in registration template

Hi Sorry if this is a duplicate, seems like last email was lost in moderation. I can't seem to customize the keycloak registration page with custom attributes that would refill upon failure. Regular fields have the value set like: value="${(register.formData.email!'')?html}" so I tried the same approach for the custom fields. I tried: value="${(register.formData.user.attributes.mobile!'')?html}" value="${((user.attributes.mobile)!'')?html}" value="${(user.attributes.mobile)!''}" ..and probably 10 other combinations but nothing works. I also did not find anything in the documentation. What is the correct value expression that would refill custom attributes upon POST failure? Best regards, cen