Hi @SaliKumarM-5560,
The SSRS is a very fragile component and it could easily break during such operations (migration). I would first go ahead and check the allowed extentions in order to be sure that this is not blocking it:
Operations Manager 2019 and 1807 reports fail to deploy
https://learn.microsoft.com/en-us/troubleshoot/system-center/scom/cannot-deploy-operations-manager-reports
After you have verified this, please restart the service and check the Application Event Log on the system, on whihc SSRS is running. What related events do you see? Can you please post some of those here after masking any sensitive information?
Did you check also the DW Data Source?
Creating a Data Source for the Operational DB on OpsMgr 2012 R2 Reporting Server
https://blog.tyang.org/2013/12/06/creating-data-source-operational-db-opsmgr-2012-r2-reporting-server/
Please post some more information about the symptoms and erros that you get.
Thanks and Regards,
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Regards,
Stoyan