Hi @Talal141218 ,
Review the following list before adding users to a native mode report server:
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You must be a member of the local Administrators group on the report server computer. If you are deploying Reporting Services on Windows Vista or Windows Server 2008, additional configuration is required before you can administer a report server locally. For more information, see Configure a Native Mode Report Server for Local Administration.
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To delegate this task to other users, create role assignments that map user accounts to Content Manager and System Administrator roles. Users who have Content Manager and System Administrator permissions can add users to a report server.
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In SQL Server Management Studio, view the predefined roles for System Roles and User Roles so that you are familiar with the kinds of tasks in each role. Task descriptions are not visible in the web portal, so you will want to be familiar with the roles before you begin adding users.
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Optionally, customize the roles or define additional roles to include the collection of tasks that you require. For example, if you plan to use custom security settings for individual items, you might want to create a new role definition that grants view-access to folders.
To learn more details about how to grant user access to a report server,refer:
https://docs.microsoft.com/en-us/sql/reporting-services/security/grant-user-access-to-a-report-serve...
If this post helps, then please consider Accept it as the solution to help the other members find it more quickly.
Best Regards,
Lucien
