Error: Participant Does Not Have Any Visible Document

I send many contract documents that require only one signature (from someone in my company), but I do need an acknowledgment of receipt from the other party per my contracts. I have always sent these by selecting "Signer" for my internal employee, and "Certified Recipient" for the person to whom I am sending the signed document. It has always worked fine and I get back the acknowledgment after the document is complete.

However, today it is not working. I am following the same process as always, but getting this error: Participant <email> (certified recipient) does not have any visible document."

I have never gotten that error before. I purposely select "Certified Recipient" because according to the Adobe role descriptions, "Certified Recipients can have no (zero) form fields assigned to them. During their "signature" process, they will be asked to either delegate, decline or acknowledge the agreement. Acknowledging the Agreement continues the signature cycle." So I've always just not assigned any fields to the Certified Recipient and the documents have processed as expected.

In looking for help as to why this error is now happening, I found this today on this Adobe Support page

https://helpx.adobe.com/sign/using/limited-document-visibility.html: 

   HOW DO I ADD NON-SIGNING ROLES (APPROVER/ACCEPTOR/CERTIFIED RECIPIENT)?

• LDV is role agnostic. 
• If you have a non-signing recipient, then that recipient must have at least one field placed on every file that you intend for them to have access to.
• If a recipient doesn't have any visible files (because no fields are placed), an error is triggered: Participant <email> (<participant role>) does not have any visible document.

This is in direct conflict with what is said above under the Roles descriptions and also not how it has worked for me previous to today. Does anyone have any idea why this is happening and/or how to "fix" it?

Thanks!