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This was an SDK bug in the early 5.x releases. Upgrade react-native-onesignal to the latest release: multiple reporters confirmed the external id is set correctly after upgrading, and the OneSignal team closed the issue as resolved on the current SDK. As a temporary workaround on 5.0.0, some users found OneSignal.User.addAlias('external_id', id) before login set the id.
Source: https://github.com/OneSignal/react-native-onesignal/issues/1565
Source: https://github.com/OneSignal/react-native-onesignal/issues/1565