The signing fingerprint you specified is already used by another Android OAuth2 client

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This error occurs when there is an existing SIGNING CERTIFICATE FINGERPRINT (SHA1) on Google Developers linked to a different account.

Solution is to delete the project that is using that SHA1 in console.developers.google.com for the old/incorrect project.

You cannot change the SHA1 fingerprint once it is set.
Remember that deleting the project takes 7 days to completely remove it.

Another option is to delete the debug.keystore and generate a new one with:

keytool -genkey -v -keystore debug.keystore -alias androiddebugkey
-storepass android -keypass android -keyalg RSA -validity 14000

Remember you have to uninstall the app otherwise you get the [INSTALL_FAILED_UPDATE_INCOMPATIBLE] error.

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