I tried this with my Mac, by turning on the choice not to save, then opening a file and adding to an item of income. When I closed the file, the option came up and I chose "Revert Changes" . After closing and reopening the file, the item I had changed was back to the prior version.
I don't know why it didn't work on your device. You could try the workarounds mentioned by other users (e.g. saving "what if" files separately).
If you still need assistance, see this help article and this one for instructions on how to contact TurboTax customer support depending on which product you are using.
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