F4freeJunior is right, if your status is valid until Feb 2021 and you requalify in 2019, you will get SEN until Feb 2023.
BUT: The requalification process will run around November 2020. At that time you will get the 2 eVouchers and the new date will be shown (02/2023).
So good news: You are requalified already until 02/2023. Bad news: You won‘t see it before around 11/2020.