Please make sure you follow the steps listed here.
- First, please make sure you had followed the steps listed here:
How do I enable Pre-Order?
- Ensure the Pre-Order status is shown as "Pre-Order Active" in the apps' Product page.
- 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.