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We have a client on a 5 domain licence for an app and they have registered 2 with no problems but with the 3rd app, the licence process is returning code 4 (which i think is LocationInvalid) which i'm not sure what that means. They are registering in the correct way as far as i'm aware so not sure why this is occurring, can you shed any light on it?
LocationInvalid means that they have the application running on a domain other than the one they have registered for that licence. Check the registered domain in LM, then ask them where they have your app installed.