Why my app crashes when I try to sign in with Google in ios-prod flavor?

I am trying to set up different firebase projects for development and production with flavors and xCode schemes. It works well in Android. But, in IOS, when I try to sign in with google_sign_in with the prod flavor it crashes the app, without any output. In the dev flavor it also works well.

To set up this I followed this post

I think the problem may be here:

To change the differents REVERSED_CLIENT_ID depending on the flavor I did this (this also is included on the post I mentioned before):

I added this to ios/Flutter/Debug.xcconfig and ios/Flutter/Release.xcconfig

GOOGLE_SERVICE_REVERSED_CLIENT_ID = {Your REVERSED_CLIENT_ID found in GoogleService-Info.plist file}

On my ios/Runner/info.plist I changed this:

	<key>CFBundleURLSchemes</key>
	<array>
	  <string>myOldReversedClientId</string>
	</array>

To this:

	<key>CFBundleURLSchemes</key>
	<array>
	  <string>$(GOOGLE_SERVICE_REVERSED_CLIENT_ID)</string>
	</array>

And finally in xCode in Build Settings -> User-Defined I defined my variable GOOGLE_SERVICE_REVERSED_CLIENT_ID according to each enviroment:

Debug-dev = com.googleusercontent.apps.{dev client-id}
Debug-prod = com.googleusercontent.apps.{prod client-id}
Profile-dev = com.googleusercontent.apps.{dev client-id}
Profile-prod = com.googleusercontent.apps.{prod client-id}
Release-dev = com.googleusercontent.apps.{dev client-id}
Release-prod = com.googleusercontent.apps.{prod client-id}

(obviously, using the REVERSED_CLIENT_ID of each GoogleService-Info.plist)

Also, when I implement the GoogleSignIn class I do it this way:

 GoogleSignIn(clientId: DefaultFirebaseOptions.currentPlatform.iosClientId).signIn()

I don't have a GoogleService-Info.plist file on my ios/runner folder

As it works for the dev-flavor but it doesn't for the prod-flavor, I think that it could be a problem when I implement the GoogleSignIn class and I define the clientId. Maybe I'm passing an Id which works for the dev-flavor but not for the prod-flavor, but I'm not sure and I don't know which other alternative I have.

Solved.

I have to sign in this way:

 GoogleSignIn().signIn()