BES admin nOOb here

I have successfully moved 3 users to a 8100 Pearl, all i did was pick úser reload>Set a new activation password>reactivated the BB hand held.
Now on to the 4th unit and it just won't activate, using the same procedure.I've wiped the HH to make sure and still no change. I'd rather not delete and recreate the user, but if that's all i'm left with then i will.
BES 4.1.3.18.
Any ideas??
Thanks.