I am facing similar issues like on Windows with VS2019. I read somewhere that Xcode 14.1 is the last version that can be used for compilations with Unreal Engine 4.27 
I am able to open the project on mac by doing some modifications, but I am not able to add any C++ class, that seem to be a reuirement on iOS when it is an Blueprint-only project.
To open the project that I sent on mac, please create there a new Unreal 4.27 project with the name EaysAdsTest. Then enable the EasyAdsPro plugin in that project and replace its Content folder with the one of the project that I converted.
For setting up the project and the EasyAds plugin with testing IDs, add/replace the following lines in the file /Config/DefaultEngine.ini
[/Script/EasyAdsEditor.AdmobSetting]
AndroidAppId=ca-app-pub-3980089200451408~7907771684
AndroidBannerUnit=ca-app-pub-3940256099942544/6300978111
AndroidInterstitialUnit=ca-app-pub-3940256099942544/1033173712
AndroidRewardedVideoAdUnit=ca-app-pub-3940256099942544/5224354917
AndroidResultTestDevice=58145FD6CFB72AAFE2D3AF253BC0736B
EnableAndroidTestSuite=False
DisableAndroidUnity=False
DisableAndroidVungle=False
DisableAndroidChartboost=False
DisableAndroidFacebook=False
DisableAndroidApplovin=False
DisableAndroidAdColony=False
DisableAndroidIronSource=False
DisableAndroidInMobi=False
DisableAndroidTapJoy=False
DisableAndroidIMobile=False
SimulateAndroidLocation=IN_EEA
IOSAppId=ca-app-pub-3940256099942544~1458002511
IOSBannerUnit=ca-app-pub-3940256099942544/2934735716
IOSInterstitialUnit=ca-app-pub-3940256099942544/4411468910
IOSRewardedVideoAdUnit=ca-app-pub-3940256099942544/1712485313
+UserTrackingDescriptionList=(language=en,localizationDesctiption=“This identifier will be used to deliver personalized ads to you in this game.”)
SimulateIOSLocation=IN_EEA
DisableIOSUnity=False
DisableIOSVungle=False
DisableIOSChartboost=False
DisableIOSFacebook=False
DisableIOSApplovin=False
DisableIOSAdColony=False
DisableIOSIronSource=False
DisableIOSInMobi=True
DisableIOSTapJoy=False
DisableIOSIMobile=False
+AndroidTestDeviceList=58145FD6CFB72AAFE2D3AF253BC0736B
+IOSTestDeviceList=ca-app-pub-3940256099942544/1712485313
+IOSTestDeviceList=D6AE41F6-32EE-40D7-8E89-B9420FE3B28C