Why does Including Ads in project with IAP create duplicate arm64 symbol error

Questions & Answers
1

Project with IAP built with Unity 2018.3.12f1 on PC, moved to Mac and compiled with XCode successfully.

When I turn on Ads in services and repeat the build process I see “2 duplicate symbols for architecture arm64” and the Xcode build fails.

2

Same occurs with latest IAP and Unity 2019.1.2f1.