Hi @B, Mahadevan
Has the schedule used to trigger the subscription expired?
The subscription page in Reporting Services contains the status of the subscription, and if there is a problem with the subscription, the Reporting Services log will contain details. You can check the trace log, which is generally located at C:\Program Files\Microsoft SQL Server Reporting Services\SSRS\LogFiles.
For more details, you can refer to this documnet: Troubleshoot Reporting Services Subscriptions and Delivery.
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Best regards,
Aniya