Problem: The user is user a form to register new users, he would like to automatically login the user after registration.
Solution: This will need custom code to be implemented. It will need to log in the user WITHOUT a password. Check this thread it explains how to use wp_clear_auth_cookie, wp_set_current_user , and wp_set_auth_cookie to login the user without password.
Check the user's custom code here https://toolset.com/forums/topic/autologin-after-registration-with-autogenarate-password/#post-1960459
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