Sadly, Good Lock modules are not available for your Galaxy device. Because the Android version of your Galaxy M21 is based on One UI Core and its a budget mid-range device as well. Typically, budget devices run on One UI Core will not have certain functionality.
You are able to download Good Lock modules from third-party sites. Sometimes it won't work either. If you wish, you have to upgrade to a One UI device.
Surprisingly, downloading Good Lock modules using the Fine Lock application works perfectly in certain Galaxy devices that runs on Android 12 based on One UI 4.1 Core.
Be sure to click the 3 dots and " ✓ Accept as Solution" when you find an answer that works for you.
