Hi there Carl94580345
when the data source credentials aren’t properly stored or are set to “Prompt for credentials” rather than “Stored securely in the report server.” In SSRS, subscriptions require that the report can run unattended, so credentials must be saved. I’d suggest:
Go to Report Manager or SSRS Web Portal.
Open the report properties → Data Sources.
Ensure the data source is using “Credentials stored securely in the report server” and provide a valid SQL login.
If it’s a shared data source, make sure the shared source has credentials stored as well.
After updating, try creating the subscription again.
If this helps kindly accept the answer thanks much