Just got off the phone with a great TAP rep. He was able to extend my expired vouchers for an additional year. They originally expired July of 2021 but now expire July of 2022. He also stated that up to 3 vouchers could be used per future booking. Also stated that vouchers for other individuals could be used for my future booking. I haven't tested this information yet but just wanted to get a data point out there for the group.