I have successfully setup the Power Automate flow for Acknowledgements and then successfully followed webinar to use Primary Addressee/Sals instead of Name, but I am now trying to follow the webinar to use “custom addressee sal” and I'm getting the following flow error:

I double-checked to verify I had renamed each step, as instructed, and cannot figure out what this error is trying to tell me. What “valid reference” is it looking for and not finding?
Below is that section of the flow. All worked until I added the last step of Compose - Formatted Name.

Thanks for any guidance, tips, other webinar to view. I also need to figure out how to do an if/then statement for the addressee and salutation if anyone has knowledge to share. Thanks!