For the var_RejectReqEmail, specifically the "'created by'.Email" portion, it gives me an error saying "Name isn't valid. This identifier isn't recognized. This error appears most commonly when a formula refers to something that no longer exists (for example, a control the you've deleted)."
For the var_RejectReqDisplayName, specifically the "'Created By'.DisplayName" part, it gives me an error saying "Invalid use of '.'".
I find these errors very confusing because as I type the values for each of these variables, the options for 'Created By' and Email and DisplayName all show up in the auto-suggestions. So the app obviously 'sees' them.
Even more confusing, if you were to edit the code (ie remove a character and re-add it), it clears the error. If you then preview the app and click on the button, the button works! If you think, "Great! It works, I'll save it!", and save (and publish) the app; it won't work live because the app still thinks something is wrong (see above errors). Please help! It is getting extremely frustrating.