Problem with using AD domain\user to login to ManageIQ

Hello all,

We are using kasparov-2.20210716154634_ddad0d6 version of ManageIQ. Users are authenticated against Active Directory. ManagaIQ has been configured using this guide at
https://www.manageiq.org/docs/reference/latest/auth/active_directory.html

The problem is that when an user logins to ManageIQ as john_doe or domain\john_doe , it treats these logins as 2 users and creates 2 users in ManageIQ.

john_doe
domain\john_doe

Anyone experienced this behaviour and knows how to deal with it? Probably set up SSSD somehow to trear the user as just one, even when using or not using the domain name.

Thank you!