Event ID - 303

Event Id303
SourceApplication Management
DescriptionThe removal of the assignment of application "Package Name" from policy "Policy Name" succeeded.
Event InformationAccording to Microsoft:
CAUSE :
The machine account for the workstation does not have permissions to the share or file system that holds the source files for the package. When a workstation runs Group Policy, it does so in the context of the machine system account for the workstation.
RESOLUTION:
Confirm that the machine account for the workstation that is applying Group Policy has at least Read access to the source files for the package that is assigned with Group Policy. You can do this by assigning permissions directly to the machine accounts, or by assigning permissions to a Security group, such as the Domain Computers or Authenticated Users group that contains the machine account.
If the source files are located on a Distributed File System (DFS) share, confirm that the machine account has sufficient NTFS and share permissions on all root replicas of the DFS root, and on all replica shares of the DFS link.
Reference LinksPackages Assigned to Computers with Group Policy Are Not Installed

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