I also just tried to build for iOS locally, and It fails with the same error as above. 6040: /APPLICATION_PATH/Android Studio.app/sdk/build-tools/25.0.3/apksigner sign -ks '/BUILD_PATH/-android/bvr/******.keystore' -ks-pass pass:'*****' -ks-key-alias 'androiddebugkey' -key-pass pass:'*****' '/BUILD_PATH/******/Temp/StagingArea/Package.apk'Ħ042: Exception in thread 'main' : com/android/apksigner/ApkSignerTool : Unsupported major.minor version 52.0Ħ043: at 1(Native Method)Ħ044: at (Native Method)Ħ049: at ( psi, waitingForProcessToExit, System.String errorMsg) in :0Ħ050: at .TasksCommon.Exec (System.String command, System.String args, System.String workingdir, System.String errorMsg, Int32 retriesOnFailure) in :0Ħ051: UnityEditor.BuildPipeline:BuildPlayerInternalNoCheck(String, String, String, BuildTargetGroup, BuildTarget, BuildOptions, Boolean)Ħ052: :Build()Ħ053: (Filename: Line: The Android build works fine when building locally (using the internal Unity compiler - the same as on Cloud Build), and I don't think I can add gradle options to it when building on Cloud Build.

Unity cloud build submodules folder