Localization via script works in editor but not in build, why?

I have a few variable strings set with LocalizationSettings.StringDatabase.GetLocalizedString().
When running my app in the editor, they get displayed, but when I build it, the strings set with Localization are empty.


Does anyone know why that could be?

Did you build the Addressable assets?
https://docs.unity3d.com/Packages/com.unity.localization@1.1/manual/QuickStartGuideWithVariants.html#preview-and-configure-your-build