{{trigger.CO Name}} not working
Following the directions in this post, I set up a smart campaign to transfer a value from a custom object to a person field every time the custom object was updated. However, it is not working for me. Looking for some help troubleshooting...
My Smart List:

The Flow steps:

And what I am seeing in the Results tab:

The trigger token is a direct copy of the field name (display name, not API name). I cannot think of anything that I did differently from the original post where several commenters mentioned their success with this approach.
Any ideas? Thank you in advance!