Why is the Pre-Order button not showing?

First, please make sure you had followed the steps listed here:
​How do I enable Pre-Order?
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Ensure the Pre-Order status is shown as "Pre-Order Active" in the apps' Product page.
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If you are still unable to see the Pre-Order button after following steps 1 and 2, kindly contact support. Some Shopify Themes required additional setup in order for the Pre-Order button to work.