Unfortunately Oracle Directory Server 11G will now be on end of life this year and it would be logical for most companies to use Oracle Unified Directory since the existing license can be used.
The PSM of the most current Identityminder (R12.6 SP7) shows that it is not compatible with Oracle Unified Directory. and that it is only compatible Oracle Directory Server 11G.
Kindly add Oracle Unified Directory to the PSM of Identityminder.
I would not make sense that Siteminder R12.52 and Arcot/Riskminder supports OUD but it is not supported by Identityminder R12.6 .