Hi Pete Orrell,
Thank you for reaching out to us on Microsoft Q&A forum.
Instead of searching for the lookup column name Requestor, search for Traveler. Please refer to the screenshot below.
We tried from our end; it's working fine for us. Kindly refer the below screenshot.
If you are still facing any issue, where you are encountering this error along with the screenshot for reference. Please let us know in the comments. We are glad to help you.
If the information is helpful, please Accept Answer so that it would be helpful to community members.
Thank you.