CP80 from IRS

You have "few" clients or a few clients getting this? A few means there are some. Few means almost none. It's relative, of course.

You can read this: "I have had at least four clients in the past week receive letters that make no sense in reference to their 2019 taxes."

Here: https://proconnect.intuit.com/community/proseries-tax-discussions/discussion/can-i-re-e-file-a-tax-return-that-has-already-been-e-filed-and/00/180778

Yes it has been a monstrous mess this year with these nonsense notices from the IRS... Just had a client call today for Highway heavy use tax which she takes care of, return was filed ,payment cleared , and she still got a notice that they're going to put a lien on her bank account for non-payment... This is a five-star client that doesn't owe anybody anything and always pays on time... I'm getting sick and tired of all these notices, they are paid by the taxpayers and if they can't do their job then they need to terminate these people and get new employees... No more covid-19 excuses or lack of money excuses or anything else...