Why do I have a 570 and 971 code on my transcripts ? When I called IRS they said my employer didn’t send in w2, which is a lie

Ok ... if they are holding the return for a W-2 verification you will probably get a letter asking for you to send a copy of the W-2 form you received.  Follow the instructions carefully and send what they want asap.

It is possible the employer did mail in the forms however they have not been input yet  OR  they were entered incorrectly.  Last year one of my clients had this happen ... and the employer did mail in the forms and all of the W-2 forms were input by the IRS EXCEPT for hers ... took 5 months to track down the paper forms and for the IRS to confirm the error and release her refund. (another good reason to efile those forms).