If you've followed all of the steps defined in the inforcenter document, and the issue still persists, I recommend that you open a PMR with IBM. They will likely have you perform a MustGather and then be able to identify whether a setting is missing or corrupt.
Opening a PMR is very quick and can be done online (my preferred manner.) I prefer the online method as I can enter a detailed description and attach files that may be of use to the technician, thus eliminating the normal first step or two on each side when opening a PMR.
It's unfortunate that the link didn't resolve the issue for you. When you do identify the root cause/ solution, please post back what it is.