You can link Google, Facebook, or Apple to your Ingress account. Once your account is linked, you’ll be able to sign into Ingress using any of the linked login providers.This feature is especially handy for players who created an account using a non-permanent email address (like a school or work email address). If you’re concerned that you may lose access to your email address in the future, you can link a backup login provider to your account to ensure you’ll never lose access to your progress.
To link a login provider:
To unlink a login provider:
To disconnect a login provider from your account, select the “Unlink" button next to the login provider you would like to disconnect. After you unlink, you will no longer be able to sign in to your account using that login provider. Note that you cannot remove the login provider you used to sign in to your current gameplay session.You can also link or unlink login providers from your Niantic Profile.
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Ingress Game GUIDE