subscriptions failure cases

Hi Maswany ,

If an error occurs during delivery, an entry is made in the report server trace log. Report server administrators can review the ReportServerService_*.log files to determine subscription delivery status. For e-mail delivery, report server log files include a record of processing and deliveries to specific e-mail accounts. The following is the default location of the log files:

The following is an example log filename:

For more details, you can read related document link as below:

Monitor Reporting Services Subscriptions - SQL Server Reporting Services (SSRS) | Microsoft Docs

Best Regards,
Henry

If this post helps, then please consider Accept it as the solution to help the other members find it more quickly.