Covid refund enquiry – Travel Stack Exchange

I booked a flight from Newark to Lisbon with a connection to Manchester, booking ref J63SGD ehic was a family trip…
The airline had cancelled the flight, which I only found out when I went into the details of our trip as Canada & the US placed restrictions on travel due to the Covid pandemic.
Air Portugal have kindly given me vouchers for the cost of the flight, however, is it at all possible to get a refund back to my credit card for the cost of the flights as it wasn’t myself that cancelled initially.
Could you please advise.
Thank you in advance, Mark