From TAP: "If you are client of one of the eligible miles programs, please enter your proof and apply for a status equivalence for the TAP Miles&Go Silver or Gold". Registered on their website, and uploaded a scan of my Flying Blue Gold card. Then you have to buy miles or join the Club TAP Miles&Go before their deadline.
Few days later I received the acceptance email:
Dear Mr. XXX,
We inform that your application for the Status Match Challenge has been accepted and you will receive an e-mail along with your digital Client Card by May, 16th.
TAP Miles&Go Program
on April 20, 2020