My client has requested I create multiple document libraries for them by adding folders and subfolders for each requested topic/subject. The client uses the search function for each document library to either search the document library as a whole or to search the respective (sub-) folder. Creating new libraries/folders has worked successfully since the beginning of the year and we had no problems with the search. Recently, when we add new folders in already existing document libraries, the "Search this Library" search does not show results for certain users. The creator of the library can generally search the library. However other users (owners and members alike) cannot search this library. All the current advice provided by Microsoft (re-indexing...etc.) under the following link (and all relevant links in this area of the site) does not solve the problem: Search results missing in SharePoint Online - SharePoint | Microsoft Docs. Any new ideas out there concerning this problem? Any support would be much appreciated!