The only time an app will ask you for a keycode is if it's on beta (meaning it's not officially released yet).
Since your BBM asked you for it I assume that it's version 8.0 or higher. To check it, go to options>device>application management> Look for BlackBerry messenger and see the number listed beside it (that's the version).
Here's my suggestions: If you're a BETA tester, go to the beta zone website and re-download the app, this will automatically generate a keycode that will be send to your BBID(email). When your prompted to replace existing bbm, press no. Copy the keycode that will be sent.
If you're not a beta test, just delete the BBM app , reset your phone and download it on appworld.
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