I have recently installed SQL Server 2022 Express, including Reporting Services.
The problem is, I cannot find the Subscription tab in the reports properties (that feature is used to send e-mails containing reports)
To create a subscription, the report must use stored credentials or no credentials to retrieve data at run time. You can't subscribe to a report that is configured to use the impersonated or delegated credentials of the current user to connect to an external data source. The stored credentials can be a Windows account or a database user account. For more information, see Specify credential and connection information for report data sources
Extra note:
Express edition has no agent so you cannot have subscriptions. You will need the standaard edition.