...
The recommended Unity Editor version has been updated to 2022.3.22f1 or higher due to modifications related to the iOS Privacy Manifest in KakaoGameSDK.
Minimum requirements related to the Privacy Manifest:
Unity version 2021.3.36f1, 2022.3.21f1, 2023.2.13f1 or higher (https://forum.unity.com/threads/apple-privacy-manifest-updates-for-unity-engine.1529026/)
If using version 2021.3.36f1, there is a Gradle version issue (https://kakaogames.atlassian.net/wiki/spaces/KS3GFPKS3GFC/pages/411894562413467727/KakaoGameSDK+Android#Android-SDK%EB%A5%BC-3.19.0%EC%9C%BC%EB%A1%9C-%EC%97%85%EA%B7%B8%EB%A0%88%EC%9D%B4%EB%93%9C ), so you must use at least 2021.3.37f1. (https://docs.unity3d.com/2021.3/Documentation/Manual/android-gradle-overview.html )
After updating the version, version compatibility related to Gradle changes, and you must not continue using the existing Gradle but apply a new one. The 'com.android.tools.build:gradle' version needs to be updated in the baseProjectTemplate.gradle file.
...