Check the setup
- Open the product and go to the checkout recovery settings.
- Check that the feature is active.
- Make sure the checkout collects the email address early enough.
- Review the message content and the sending rules.
- Publish the product and run a controlled test without finishing the payment.
- Check the report of recovered transactions.
What to fix beyond the automation
Look at page speed, the number of fields, the payment methods on offer, how clear the price is and the tax messaging. A reminder will not fix a checkout that is hard to read.
The feature will not recover every visit. Without an email address and the consents a given message requires, the system may have neither the grounds nor the means to send a reminder.