Users denied unsubscribe function
Welcome to civicrm SE, Can you make sure if you have 'CiviMail: access CiviMail subscribe/unsubscribe pages' permission set to anonymous and autheticated sure?
Can Check under CiviCRM &gt;&gt; Administer &gt;&gt; Users and Permissions &gt;&gt; Permissions (Access Control) &gt;&gt;  WordPress Access Control