I'm having problem almost the same like this one described here but I don't use Push Plugin. When I try to build Android app with FCM Plugin enabled, I get this:
[string/google_api_key] C:\Projekti\app\platforms\android\res\values\strings.xml
[string/google_api_key] C:\Projekti\app\platforms\android\build\generated\res\google-services\debug\values\values.xml: Error Duplicate resources
1> :mergeDebugResources FAILED
When I remove <string name="google_api_key">apikey</string>
from strings.xml or values.xml it simply gets overwritted and build fails.
Does anyone have idea what to do? Cordova and cordova-plugin-fc are at their latest versions. Other plugins are cordova-plugin-whitelist and mx.ferreyra.callnumber.