Multisite error when adding a user: already a member of this site

Found a workaround, remove the user via PHPmyadmin, found in wp_user (find ID of user) and wp_usermeta (find meta info of user). Remove wp_capablities and wp_user_level from wp_usermeta and add the user again to your site via the WP backend. Somehow this reimported the user again and shows up in the user list this time. .

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Hata!: SQLSTATE[HY000] [1045] Access denied for user 'divattrend_liink'@'localhost' (using password: YES)