Setup Duo Proxy LDAP w/ vRealize

We are trying to utilize DUO for management portals, like the following:

Netapp, Cisco UCS, VMWare products

My confusion is on how in these applications I can pass the username as a Full DN instead of just the username, that seems to be the consensus in another community post in regards to VMWare.

But in vRealize as well as Cisco UCS, i’m not sure how else to pass SAMAccountName or UserPrincipalName as a DN, if anyone has any guidance that would be great, thanks!