I get this in XCODE when building for IOS. The complete message is:
d /Users/mikaelwinander/Library/Developer/Xcode/DerivedData/Unity-iPhone-fbmwlirkkaqwueajhgqbdrtnighb/Build/Products/ReleaseForRunning-iphoneos/LetterFall.app/LetterFall normal arm64 (in target: Unity-iPhone)
cd /Users/Shared/LetterFall/Builds/LetterFall\ .5
export IPHONEOS_DEPLOYMENT_TARGET=9.0
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang++ -arch arm64 -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS12.4.sdk -L/Users/mikaelwinander/Library/Developer/Xcode/DerivedData/Unity-iPhone-fbmwlirkkaqwueajhgqbdrtnighb/Build/Products/ReleaseForRunning-iphoneos -L/Users/Shared/LetterFall/Builds/LetterFall\ .5 -L/Users/Shared/LetterFall/Builds/LetterFall\ .5/Libraries -L/Users/Shared/LetterFall/Builds/LetterFall\ .5/Libraries/Plugins/iOS/Firebase -F/Users/mikaelwinander/Library/Developer/Xcode/DerivedData/Unity-iPhone-fbmwlirkkaqwueajhgqbdrtnighb/Build/Products/ReleaseForRunning-iphoneos -F/Users/Shared/LetterFall/Builds/LetterFall\ .5/Frameworks/Plugins/iOS -F/Users/Shared/LetterFall/Builds/LetterFall\ .5/UnityAds -filelist /Users/mikaelwinander/Library/Developer/Xcode/DerivedData/Unity-iPhone-fbmwlirkkaqwueajhgqbdrtnighb/Build/Intermediates.noindex/Unity-iPhone.build/ReleaseForRunning-iphoneos/Unity-iPhone.build/Objects-normal/arm64/LetterFall.LinkFileList -Xlinker -map -Xlinker /Users/mikaelwinander/Library/Developer/Xcode/DerivedData/Unity-iPhone-fbmwlirkkaqwueajhgqbdrtnighb/Build/Intermediates.noindex/Unity-iPhone.build/ReleaseForRunning-iphoneos/Unity-iPhone.build/LetterFall-LinkMap-normal-arm64.txt -miphoneos-version-min=9.0 -dead_strip -Xlinker -object_path_lto -Xlinker /Users/mikaelwinander/Library/Developer/Xcode/DerivedData/Unity-iPhone-fbmwlirkkaqwueajhgqbdrtnighb/Build/Intermediates.noindex/Unity-iPhone.build/ReleaseForRunning-iphoneos/Unity-iPhone.build/Objects-normal/arm64/LetterFall_lto.o -fembed-bitcode-marker -stdlib=libc++ -fobjc-arc -fobjc-link-runtime -weak_framework CoreMotion -weak-lSystem -framework Security -framework MediaToolbox -liPhone-lib -framework CoreText -framework AudioToolbox -weak_framework AVFoundation -framework AVKit -framework CFNetwork -framework CoreGraphics -framework CoreMedia -weak_framework CoreMotion -framework CoreVideo -framework Foundation -framework OpenAL -framework OpenGLES -framework QuartzCore -framework SystemConfiguration -framework UIKit -liconv.2 -lil2cpp -framework UnityAds -lFirebaseCppAnalytics -lFirebaseCppApp -framework AdSupport -framework CoreTelephony -framework StoreKit -weak_framework Metal -framework UnityAds -Xlinker -dependency_info -Xlinker /Users/mikaelwinander/Library/Developer/Xcode/DerivedData/Unity-iPhone-fbmwlirkkaqwueajhgqbdrtnighb/Build/Intermediates.noindex/Unity-iPhone.build/ReleaseForRunning-iphoneos/Unity-iPhone.build/Objects-normal/arm64/LetterFall_dependency_info.dat -o /Users/mikaelwinander/Library/Developer/Xcode/DerivedData/Unity-iPhone-fbmwlirkkaqwueajhgqbdrtnighb/Build/Products/ReleaseForRunning-iphoneos/LetterFall.app/LetterFall
duplicate symbol _OBJC_CLASS_$_UnityAdsUnityWrapperDelegate in:
/Users/mikaelwinander/Library/Developer/Xcode/DerivedData/Unity-iPhone-fbmwlirkkaqwueajhgqbdrtnighb/Build/Intermediates.noindex/Unity-iPhone.build/ReleaseForRunning-iphoneos/Unity-iPhone.build/Objects-normal/arm64/UnityAdsUnityWrapper-ae24e38f924131e40c49e1db7340e33ff0004ed65ee5ff27c27446ef2b86d435.o
/Users/mikaelwinander/Library/Developer/Xcode/DerivedData/Unity-iPhone-fbmwlirkkaqwueajhgqbdrtnighb/Build/Intermediates.noindex/Unity-iPhone.build/ReleaseForRunning-iphoneos/Unity-iPhone.build/Objects-normal/arm64/UnityAdsUnityWrapper-ae24e38f924131e40c49e1db7340e33f05fae286e9e16b0a793ce89a63310d5a.o
duplicate symbol _OBJC_METACLASS_$_UnityAdsUnityWrapperDelegate in:
/Users/mikaelwinander/Library/Developer/Xcode/DerivedData/Unity-iPhone-fbmwlirkkaqwueajhgqbdrtnighb/Build/Intermediates.noindex/Unity-iPhone.build/ReleaseForRunning-iphoneos/Unity-iPhone.build/Objects-normal/arm64/UnityAdsUnityWrapper-ae24e38f924131e40c49e1db7340e33ff0004ed65ee5ff27c27446ef2b86d435.o
/Users/mikaelwinander/Library/Developer/Xcode/DerivedData/Unity-iPhone-fbmwlirkkaqwueajhgqbdrtnighb/Build/Intermediates.noindex/Unity-iPhone.build/ReleaseForRunning-iphoneos/Unity-iPhone.build/Objects-normal/arm64/UnityAdsUnityWrapper-ae24e38f924131e40c49e1db7340e33f05fae286e9e16b0a793ce89a63310d5a.o
ld: 2 duplicate symbols for architecture arm64
clang: error: linker command failed with exit code 1 (use -v to see invocation)
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