If staff have been enrolled in an AE pension scheme and have requested to leave your automatic enrolment pension scheme within 12 months before the third year anniversary of my duties start date or previous re-enrolment date , do I need to re-enrol them again as part of the duties of this re-enrolment anniversary?

You can choose whether to re-enrol a member of staff who requested to leave your automatic enrolment pension scheme within the 12 months before your re-enrolment date. So in this case you don't have to re-enrol this staff member.

Whether you have staff to put back into your scheme or not, you must complete a re-declaration of compliance to tell us how you have met your duties.