MSAD uses NAMELASTNAME instead of actual username as login

Hello,

We configured a MSAD in an oracle EPM hyperion 11.1.2.4 system, and while the configuration, pretty standard, succeded, shared services uses the Name Lastname part as username instead of the actual username of the person. For example it uses John smith instead of jsmith. The issue is weird also because this same MSAD is used for other applications as well and works ok. The OBJECTGUID is set as unique id as it cannot be changed.

Any idea what the cause might be or how to search for a solution?

Nothing to do with HFM but no Shared services section here.