Hello Ranjit
MX_reconcile is not relevant for IDM 7.2 sp7 onwards.
Reconciliation is now done as part of housekeeping job defined at dispatcher level.
Can you check if IDM ui for user also show this new Privilege linked via business role.
U can check it via MX_assignment attribute defined for user or via idmv_link_ext view.
If it does not appear then u can use uis_repairentry() to repair the missing linkage.
help.sap.com/saphelp_nwidmic_72/helpdata/en/66/9ab51174e4407b8d2fc24e9e5267a4/content.htm?frameset=/en/e1/8645dd31a44bdd95b0148cab621415/frameset.htm
Regards
Pradeep