Language Cloud automated translation not working

I have just passed from 2019 to 2021 version and I can't use the Language Cloud automated translation. I have not used it yet, since I upgraded the version, and in the past I had all the free characters available. In addition, when I open settings, the TM / Language Cloud options can never be selected. Even if I select it, when I exit and re-enter the Settings page, the white boxes are unchecked (they uncheck by themselves). And when I ask for pretranslation, nothing happens. What should I do?