The 32bit module needed by the command 'pam-config -a --sss' does not exist on Leap 15.6. I cannot install it. On Leap 15.6 the command 'pam-config -a --sss' does not work. You can argue that it is than the fault of the package sssd, but because of the problem I found as described in boo#1227216 I'm more inclined the see this as a pam-config problem.