Resolution

To check the status of a SSRS subscription or change subscription options, please follow steps below:

Open SSRS Web Portal in Chrome or Internet Explorer
Browse to the folder where the custom report is located.
Hover mouse on the report and click on the dropdown or 3 dots on the right of report's name and select Manage
Click on Subscriptions in the left navigation menu.
Subscriptions that are already created for the report and their status are displayed in the right section
Click on Edit to the left of any subscription to edit options for that subscription

Browser not supported