Unable to edit organization in Deployment Manager

While doing CRM server migration activity of CRM 2013 from one organization to other, database server being a cluster one was not possible to migrate, therefore, we prepared a database server in SQL Always on Cluster. Data from the CMO database was successfully imported to the new FMO DB server with new connection String (SQL Listener)

The issue was encountered while making a connection between the application and the database with the new connection string and from the application, communication was unsuccessful. We tried "Edit Organization" in deployment and couldn't complete as it gave error "SQLServerAgent" services not running on new server.

We followed below steps:

1. Modify the connection string in Registry Editor by pointing it to the new Database(updated in "configdb" data source) - Successful

2. Options tried for error "SQLServerAgent" services not running on new server:

                               Restarting the SQL Server Agent Services

                               Changing parameter string, server string from DB(Organization, Server table) instead of Deployment Manager

                               Starting SQL Server Agent Services on Old DB

                               Opened TCP/UDP 443, 445 port from CRM server to SQL server

Is there any other place new server details should be updated before changing in Deployment Manager?  Or any settings which should be changed?

Note: Logged In user has complete access everywhere

Can anyone help on this?Thanks