TAP refunds tickets - NO PROBLEM!
I must say my experience is quite different from some of the above posters.
I bought 2 refundable tickets in 2025 1) FAO-FRA one way Y and 2) FAO-YOW return J.

When I cancelled, I was given a refund number beginning with the letter R.
Both tickets were credited back to my card within 7 days.

I also got 2 emails for each ticket, one saying the claim had been received (immediately), and the 2nd (a week later) that the refund had been processed.
Sorry to hear about the negative experiences the above posters had.
I found the customer service reps to be polite and professional in both cases.