"..... I never received it due to an audit. "

No---it is too soon for an audit of a 2019 return, so something else delayed your refund.  Did you receive a letter from the IRS that requested more information or that you verify your identity?  Every letter from the IRS is not a "audit."  What did the letter say?  What numbers were in the top corner?   WHY are you amending your return if it has never been fully processed?  You should not do that or you can cause even more confusion and delay.  Sometimes we see frustrated users who think sending an amended return will shake a refund loose when they are just tired of waiting for a refund.  That does not work.

(what the letters from the IRS mean)

I GOT A LETTER FROM THE IRS   

https://ttlc.intuit.com/questions/3605673-i-got-a-letter-or-notice-from-the-irs