Hello @Nancy Elshaier
Welcome to the Atlassian community.
Are you able to access other pages in the same Confluence space, or pages in other Confluence spaces?
If you can access other pages in the same or other spaces then it is possible the specific page or a page under which it is nested has a Restriction added to it. Or if you can't access any pages in the space then your permissions to the space may have been changed.
You will need to contact the administrators of your Confluence instance to report the problem so that they can review the permissions for the page and space.
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