'There is an update problem when testing inside the Play Store

I installed the app after receiving a link from the Play Store as an internal test. I uploaded the update after versioning up, but it didn't update, so when I pressed the uninstall button, it said it wasn't an app installed through the Play Store, but this seems to be the cause. For reference, if you remove it and reinstall it, it will be installed with the updated app. What's wrong?



Sources

This article follows the attribution requirements of Stack Overflow and is licensed under CC BY-SA 3.0.

Source: Stack Overflow

Solution Source