Even if sometimes staff members look on this forum and post from time to time, the help on this forum is mostly provided by people who are doing this as a volunteer. You can contact Mathworks support directly with the 'Contact Us' button at the bottom of the page. This page describes the benefits of the SMS. As I understand it, you should be able to download and use any release starting from when you bought your license (and a few prior to that), up to the newest release that was published before your subscription ends. In your case that would mean R2021b, unless R2022a is much earlier than usual. As I understand it correctly (and if the machine translation of your question is correct), your license is a lifetime license to use these specific releases of Matlab on 1 computer at a time (with a handful of switches allowed per year), as long as you are a student.
If you want an official answer tailored to your license, you should contact support.