What should I do if I received a 1099 from an employer that I didn't work for?

Are you asking about a Form 1099-R? This is for a retirement distribution. If you did not take a retirement distribution contact the issuer.

To report Form 1099-R:

1. Click on "Search" on the top right and type “1099-R”  
2. Click on “Jump to 1099-R”