Hello Hello!
Could you do me a quick favor and retest your full automation flow starting from the trigger and take a look at the output?
I mirrored your formula and automation and didn’t have any issues with the value being populated into the email.
Generally, I find that retesting the trigger in automation resolves a lot of strange behaviors.

Let me know if it still leads to an empty value in the email preview and we’ll troubleshoot it!
Hello Hello!
Could you do me a quick favor and retest your full automation flow starting from the trigger and take a look at the output?
I mirrored your formula and automation and didn’t have any issues with the value being populated into the email.
Generally, I find that retesting the trigger in automation resolves a lot of strange behaviors.

Let me know if it still leads to an empty value in the email preview and we’ll troubleshoot it!
@Ben.Young
I had done that a couple times, but I must not have tested from the very start after the last update to the formatting of the date.
Thank you!