I have booked a flight to the UK for June 2021 using points + fees and taxes. (I'm dual UK/USA citizen and have time built in to do quarantine if necessary). I was attempting to buy trip insurance using the Travel guard website and realized that there was no place to submit the voucher code that I got from canceling my 2020 European trip. Apparently, you have to call the company to use the voucher, and its sent to another department for approval within 5-7 days.
Margaret