According to immigration law in the U.S., employers are responsible for only hiring authorized workers. While you do have to provide your employer with the required proof that you are eligible to work, you do not need to discuss your DACA application or status with your employer.  If you suspect that your employer might be discriminating against you, or has fired you because of your immigration status, that could be a violation of the Immigration and Nationality Act (INA) or Title VII of the Civil Rights Act of 1964 (Title VII).