H1b Dropbox visa refused with 221g

I applied for my visa stamping in Mumbai. Gave NIE and offer letter. Got 221g with message ‘until PP is lifted’. Please suggest what to do next.
Really appreciate any advice.

May be the VO missed to look at the NIE letter. You can email the NIE request to consulate and if approved email them again to process your visa application. If accepted, they will email to you submit your passport.

Thank you sir for the response. Where should I send this email? mumbaiNIE@state.gov or some other email address?

Yes if you applied at Mumbai consulate.