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Description of problem: SSSD in 6.8 will have all the recent features like smart 2-factor authentication prompting and Smartcard PIN prompting. To make those features visible to the user the changes from https://bugzilla.redhat.com/show_bug.cgi?id=1204864 are needed for 6.8 as well. It would be nice if they changes can be backported to 6.8. If not the documentation has to be extended to explain how to do the changes manually.
Based on the PM input and given that we are rather late in the RHEL-6 cycle, we have decided to close the request as WONTFIX. Users requiring Smart Card support in SSSD will need to manually change PAM configuration to enable it (or move to RHEL-7.2+). I will open a doc bug, to note the required PAM changes in official docs.