Note: This article is for customers who have purchased Due on the App Store. Customers who are using Due macOS through Setapp do not require the Upgrade Pass.
Ensure that you have the macOS Upgrade Pass purchased. The Mac Upgrade Pass is separate from the iOS Upgrade Pass. This helps to keep the price low for users on a single platform.
To check your subscriptions, you can follow this link: https://support.apple.com/HT202039
The macOS Upgrade Pass is appended with the word "(Computer)", while the iOS Upgrade Pass is not.