C Corp client e-filed FYE 6/30/2020 T/R in March 2021.  Refunds were requested for US and IL.  I have the efile confirmation numbers from Lacerte.  No refund has been received so far from either.

Corp just received Notice CP259, stating the Corp hadn't filed F1120 for FYE 6/30/2020.  

I know the IRS is behind.  I wonder if this was a case of the return-processing hand of the IRS being behind and the delinquent-return-catching hand is following up on the Form 1120s (while the other 998 IRS hands are pursuing penalties and collections).

CP259 asked TP to MAIL IN a copy of the return.  Well, we know the TP-correspondence-processing hand is still slowly working.  (What - 2 million pieces of unread correspondence as of December, right?)

So, what is client to do?  Anyone out there has experience or ideas?  (....  @IRonMaN skip your ideas.  Just tell another Paddy joke....)