Problem: How to use the cred_filter_field_before_add_to_form hook to make a user first and last name required on a User Form?
Solution: This requires some custom code, that you can write based on this example: https://toolset.com/forums/topic/user-form-problem-first_name-and-last_name-dont-work-in-required_fields_func/#post-1472921
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