My w2 does not have a b box for the requested information. What do I use for an employer number?

A valid W-2 does in fact, have a box b that's even labeled "Employer Identification Number (EIN)". YOu may want to double check that on your end. Otherwise, you're not looking at a valid/legal W-2 and would need to contact your employer. They are required by federal law to provide that information, and if mailed to you it's required to be postmarked by Jan 31 or earlier.

Are you really looking at a W-2?  Or something else?

You posted your question from a version of online Live software.  If you are really using that “Live” software you can get help from your “expert.”

You are posting from TurboTax Live.  You can arrange for the Live help you are paying the extra fee for with your questions from 5 a.m. to 9 p.m. Pacific time.

https://ttlc.intuit.com/questions/4124827-how-do-i-connect-with-a-tax-expert-in-turbotax-live