Hi @Kynaston, Matt (KUBRICK GROUP LIMITED)
Empty results usually means that required permissions are missing. To query SharePoint list items, depending on the list type the following permission scope needs to be specified:
For SharePoint List: Sites.Read.All
or Sites.ReadWrite.All
For SharePoint Library: Files.Read.All
or Files.ReadWrite.All
You need to check the permissions of the list items too. Some list items will have unique permissions and that makes other users unable to access them. Please refer to the following document
https://support.microsoft.com/en-gb/office/customize-permissions-for-a-sharepoint-list-or-library-02d770f3-59eb-4910-a608-5f84cc297782
Also the following setting might also cause the item only available for the creator
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