
Whether you have granted these users with read permission to access SharePoint sites? Or these users are external users?
Whether these users can not see all documents in one site collection or in all site collections? In one document library or all document libraries?
Please follow below tips to troubleshoot the issue.
1.Make sure that all documents are published and approved.
2.Make sure that all documents are checked in.
3.Check all documents whether have unique permissions.
4.Check all documents whether are applied sensitivity labels.
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