Hi,
The badge notification email isn't related to your activity on Answers. However, your Answers past activity now redirects to Learn, since the two platforms were recently brought together.
As part of this process, only the most helpful and most viewed threads were migrated to Q&A, while the rest were archived. Answers and Learn profiles weren't merged, but a few members with special community roles had their profiles mapped.
Just a quick note, the Microsoft Community Hub (aka tech community) wasn't part of this migration, so your profile information there will remain separate from Learn.