Pass In Fields from Qualtrics using Query Strings

I'm having some trouble, specifically with pass in and pass out fields. The survey is set up such that:

Panel Provider --> Qualtrics --> Sawtooth --> Panel Provider

In the Qualtrics portion, we capture some important demographic information and can successfully capture the respondent ID in Qualtrics that the panel provider requires us to pass through for their monitoring. However, when the survey moves from Qualtrics to Sawtooth using the survey access link, we seem unable to pass along any information using the query strings in the URL and the pass in fields in Sawtooth. I've been trying to troubleshoot it and it seems that there's something going on query strings specifically. As an example, let's focus on the respondent ID (rid) embedded data field in Qualtrics.

When the redirect link from Qualtrics to Sawtooth has this at the end of the URL
...rid=${e://Field/RID}
it passes through nothing. When I get the data from Sawtooth, the rid field is blank.

However, when instead the redirect link from Qualtrics to Sawtooth has this at the end of the URL:
...rid=1234567
it pass through perfectly.

I'm trying to figure out what might be going on here. I talked with Qualtrics Support and they believe it is not an issue on there end, which leads me here. Anyone have ideas about what might be going on?

Resolved
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