On Red Hat Enteprise Linux 6 system, why are LDAP/sssd Users not able reset Password?

Issue

• User is having trouble with resetting password. The below errors logged in /var/log/secure:

Dec 19 14:32:00 ncc11645 sshd[30943]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=c001288974.p3fpd.na.cat.com  user=gawartm                                        
Dec 19 14:32:00 ncc11645 sshd[30943]: pam_sss(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=c001288974.p3fpd.na.cat.com user=gawartm                                          
Dec 19 14:32:00 ncc11645 sshd[30943]: pam_sss(sshd:auth): received for user gawartm: 12 (Authentication token is no longer valid; new one required)                                                            
Dec 19 14:32:00 ncc11645 sshd[30943]: pam_sss(sshd:account): User info message: Password expired. Change your password now.                                                                                    
Dec 19 14:32:00 ncc11645 sshd[30943]: Accepted password for gawartm from 10.229.6.181 port 51125 ssh2                                                                                                          
Dec 19 14:32:00 ncc11645 sshd[30943]: pam_unix(sshd:session): session opened for user gawartm by (uid=0)                                                                                                       
Dec 19 14:32:00 ncc11645 sshd[30943]: User child is on pid 31031                                                                                                                                             
Dec 19 14:32:05 ncc11645 passwd: pam_unix(passwd:chauthtok): user "gawartm" does not exist in /etc/passwd                                                                                                      
Dec 19 14:32:11 ncc11645 passwd: pam_sss(passwd:chauthtok): Authentication failed for user gawartm: 7 (Authentication failure)                                                                                 
Dec 19 14:32:12 ncc11645 sshd[31031]: Connection closed by 10.229.6.181
Dec 19 14:32:12 ncc11645 sshd[31031]: Transferred: sent 3824, received 2176 bytes
Dec 19 14:32:12 ncc11645 sshd[31031]: Closing connection to 10.229.6.181 port 51125
Dec 19 14:32:12 ncc11645 sshd[30943]: pam_unix(sshd:session): session closed for user gawartm

• This Red Hat Enterprise Linux 6 system is configured as ldap client using sssd.
• Red Hat Directory Server 9 is the ldap server.