The EEM server was working fine with two nodes. After adding the third node the first two nodes fail to bind to LDAP.
While troubleshooting we found that the dxserver could not be started on the primary server.
The itechpoz_trace.log on the primary had the following error.
*  20180717.093219.452 DSA_I2690 Multiwrite-DISP: Peer 'itechpoz-SECONDARY-SERVER' updated
*  20180717.093320.505 DSA_E2735 Multiwrite-DISP: Unable to synchronize with peer 'itechpoz-THIRD-SERVER'
EEM Release: 12.6
EEM HA with three nodes
The primary server was not able to communicate with the THIRD server.
The server was using /etc/resolve.conf for ip resolution and it was blank.After updating the file manually and Restarting dxserver and now the EEM HA is working fine.