So if I put in my Intuit Customer account number and it showed no results, I am Okay?

Sounds like you and your clients are ok.

In my case, the link didn't work.  I do have affected clients.  This is a MESS!

They sent it to me and I checked and I knew I did not have any affected clients.  I do almost all of the 1040's for all my corporate and partnership clients; then 2 days later I got email saying email was sent to me in error.  I guessed they figured out how to check the link themselves after sending notice.

There have been numerous responses to this.  It is not SPAM.

See this recent thread that *should* have come up when you searched:

https://accountants-community.intuit.com/questions/1872987-is-the-email-regarding-critical-alert-qbi...

Strange! This did not come up when I searched for it.

I searched for   'critical alert'  and got nothing too, which is weird since its right in the title of that link.

Sounds as if the search feature is not doing everything it should do.

And you are surprised ?????
I think I searched for QBI, then filtered.

It does come up, as the third one down, when you type in the wording of the OP's question.

not sure why this didnt warrant a yellow banner alert and explanation for the email

we've been so over trained to not click links in email, this goes against what weve all been told.

The consensus is that the PTB are trying to keep their error "under the radar".  

I am just finding about this now through an alert on Pro series.  was closed 2 weeks around the email date, so if i received one I probably deleted it going through the several hundred emails I had come in those 2 weeks.  now I see 16 returns could be affected.  13 years using pro series.  The last two years = I am finding a new software company.  This is the last straw for me.  they should be paying for penalties and interest for any money owed on amended returns.  Plus now me a one CPA operation has 16 amended returns to file.  

OK I called pro series and they explained that all 16 returns may not be effected. just that those are the max it could be.  so my office manager is going through the partial submission IDs to see which returns it would be. then i match the file (which would already have been changed with the update to the return that was filed.  if no change on the QBI form, then nothing to amend.  So I may still want to torch my software, but for now I hold off.