After changing the service account’s password we have found that the SCVMM is unable to create the hosting connections to the back-end servers. Also, the new password is not getting updated to the database.
Here in below screenshots you will see that both the cluster nodes has stopped getting the response from the machines:
Currently we are working to find out if this behavior is expected with the current version/build of SCVMM
and if we need to follow this article (https://social.technet.microsoft.com/Forums/windows/en-US/b29adba0-1e86-4493-8f72-7c535590291d/cant-change-run-as-account-in-the-host-access-tab-for-a-clustered-host?forum=virtualmachinemgrclustering) as the final solution, as it was posted on Feb 2013:
“the only option is to remove the cluster from VMM, and add it again with the right run as account.”
If it's a BUG with SCVMM that it cannot take the password change of the service account?