BPS Users Authentication Issue

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Hi Everyone!
In the WEBCON environment we use, it is not possible to synchronize users with local AD. However, we want and can use AD to authenticate users. So we added our WEBCON users as BPS users.
In the BPS user synchronization configuration we have set: Synchronization source = None and in the system configuration Authentication Providers = Windows Active Directory.
Once completed, all BPS users have been synchronized and are listed in the CacheOrganizationStructure table with COS_Login in UPN format.
Now the problem:
When a user logs in to the portal, the system sees him in the domain\user format and none of the permissions granted to him work.
By the way - when we "manually" change COS_Login to the domain\user format - everything works fine. However, after some time, WEBCON updates the entries in the CacheOrganizactionStructure anyway and everything falls apart.

Dear colleagues, does anyone know how to force IIS to use the UPN format for user authentication or how to force WEBCON not to correct entries in COS_Login?

Thanks in advance for any suggestions.