Error making a MacOS build - Plugin Collision

  • MacOS Catalina
  • Unity 2020.1.8f1
  • Pun 2 Free - 2.22
  • MacOS/Android/Windows plugins installed

I can produce an Android and a Windows build, but when I try to build for mac I get the following error:
Plugin '' is used from several locations:
 Assets/Photon/PhotonVoice/PhotonVoiceLibs/x86_64/ would be copied to <PluginPath>/
 Assets/Photon/PhotonVoice/PhotonVoiceLibs/x86/ would be copied to <PluginPath>/
Please fix plugin settings and try again.

How can I fix it?