VIDM health shows unhealthy as below due to expired "root" and "sshuser" password.
Environment
3.3.X
Cause
"root" and "sshuser" password expires as per the validity set.
Resolution
Follow the below steps to change the Expired Password for "root" and "sshuser":
Logon to Each VIDM node as "root" with Expired Password. It allows you to login.
However, as soon as you logon, you would be prompted to change the password.
Change the password (might be same) on each node.
Repeat same process to change password for "sshuser".
Additional Information
VMware Identity Manager "root" and "sshuser" password should be expired and should be valid else, VIDM health would show Unhealthy and Inventory sync from VRSLCM would not work.