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I found the Solution:
Finf the Report web config in the below path :
C:\Program Files\Microsoft SQL Server\MSRS12.MSSQLSERVER\Reporting Services\ReportManager\web .config
Replace or add below line: to set admin credential for all users to access the report.
<authentication mode="Windows" /> // Authentication mode to be set to windows<identity impersonate="true " userName="UserName" password="Password"/> // identity impersonate to be set to true and User name & Password of the SQL Server administrator should be added.