Ensure the OBB name exactly matches what the APK expects. Common mismatches:

Here is the breakdown of that naming convention:

The file is the primary data container for the game’s assets, including textures, audio, and map data.

Modified APK without proper signature matching the OBB. Fix: This is common with cracked versions. Try a different APK that matches your specific OBB. Alternatively, use a Lucky Patcher workaround (but this is not recommended due to security risks).