Embedded Data from Authenticators Not Included in Response

Hello!
I am pretty new to Qualtrics and this is my first Community post - thank you in advance for all your future help!
I'm struggling with a sporadic issue related to authenticators and embedded data.
At the start of my survey, the user enters 3 identifiers to pull information stored in a contact list.
As you can see in the image, in most cases, it's going swimmingly, but the third line down all the columns are blank - that's where the embedded data would be.
(Note: The blank fields in the 5th and 6th entries down is because the previous survey, where the embedded data was originally created didn't store them - different issue. I can easily fill that in, so less of priority than this issue.)
Here's the set-up.
(Note: The first Embedded Data section comes from an emailed link. The rest is coming from a different contact that the Authenticators are referencing.)
Does anyone have thoughts on what would cause a sporadic problem like this?
Appreciate any thoughts/suggestions - thanks so much!
erin