RMD penalty waiver

Taxpayer did not take RMD for 2021.
I know that form 5329 should be filed. I want to efile it with the return. How do I ask for a penalty waiver? Can I attach a request letter as a pdf to the efiled return and instruct the taxpayer not to pay and wait to hear from the IRS? Or is mailing the penalty waive letter required?
I hesitate to mail anything to the IRS now that can be efiled.

Your software should have a place in the 5329 section to ask for the waiver. See Part IX of the Form 5329.

Your software should have a place in the 5329 section to ask for the waiver. See Part IX of the Form 5329.

Found it. Thank you!

Have you all run into situations where the IRS has assessed the penalty for missed RMDs even though a waiver request was submitted on 5329? Or do they typically waive?

I have never seen any correspondence form the IRS on this topic. I suspect I am not alone.

I have never had a penalty waiver denied in this situation.