What is the hold up on form 2210? Why do I need to wait until February 22 to be able to complete my filing?

I am being penalized for underpayment of my estimated taxes. (I actually paid more than the amount that TT suggested for each quarter when I filed last year, so this is very irritating, but whatever.) Is the hold up on the part of TT or the IRS? Why can't I file now?