(iOS) GooglePlayServices not found

I'm getting this error on my Mac after updating to the latest Unity 2021 LTS.

Library/PackageCache/com.unity.services.mediation@0.4.1-preview.1/Editor/Build/PostBuild/IosDependencyUpdatePostBuild.cs(5,7): error CS0246: The type or namespace name 'GooglePlayServices' could not be found (are you missing a using directive or an assembly reference?)

I've already tried by deleting the PackageCache but it didn't work.

Any ideas?