Hi @Desh ,
If you create and process the e-mail subscription by using a domain user account that is different from the service logon account of the Reporting Services Windows service, the AuthzInitializeContextFromSid API function call may fail. If the function call fails, you may have to configure the settings on the domain of the computer that is running Reporting Services to resolve the problem. You could refer to AuthzInitializeContextFromSid API function fails for details. I hope this will help you.
In addition, if above suggestions don't work. Could you please inform me more detailed error information in trace log(C:\Program Files\Microsoft SQL Server Reporting Services\SSRS\LogFiles)?
Best Regards,
Joy
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