I have been invited to the preview program by a friend earlier this week, but am yet to receive a service message on the Xbox? How long does it usually take?
Just because you have been invited doesn't guarantee that you will be accepted into the preview program.
After E3 there has been an influx of people suddenly wanting to be preview members so there is a backlog at the moment.
All you can do is wait.If you get in you will get a notification on xbox live,if you don't get in you will not here anything.
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