Setting a 5 Day before Date formula

I have a Smartsheet with a working formula
But when I try and apply the same formula to a different Smartsheet I am receiving an error. Both columns are Dates...Any idea what I am doing wrong? Receiving Invalid Operation
Answers
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Hello, a couple of questions, Are you the Admin of the sheet? Is the target column restricted to dates only?
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Hi @Todd M Keller ! Thanks for taking the time. I am Admin on both sheets. I have tried both restricting and not restricting to dates only. The working formula does not have 'restricted to dates only' as an FYI.
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Interesting..... The only way I could get an error was to restrict to dates only. Also, I have run into some strange issues if I don't save and reload the sheet. You could try protecting the entire formula in parenthesis......
=([Mirror EAD]@row - 5)
Also, just in case, change it back to a cell formula for troubleshooting.....