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I am reading about the SharePoint online limitation & boundaries:

https://docs.microsoft.com/en-us/office365/servicedescriptions/sharepoint-online-service-description/sharepoint-online-limits

and it mentioned the following regarding manage items' permissions

A list can have up to 30 million items and a library can have up to 30 million files and folders. When a list, library, or folder contains more than 100,000 items, you can't break permissions inheritance on the list, library, or folder. You also can't re-inherit permissions on it. However, you can still break inheritance on the individual items within that list, library, or folder, up to the maximum number of unique permissions in the list or library (see the next section). To learn more about other restrictions for viewing large lists, see Manage large lists and libraries in Office 365.

but I am not sure if we have a list which contain let say 100,000 items and we organized them into 3 folders (each folder of 33,000 items), then can we manage the permission on the folder level (for example to re-inherit all the 33,000 items to have the folder permission)?

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Here's an answer for your reference: When we are starting to convert our users from File Servers to SharePoint Online, the content loading into Document Libraries start to be complex. Permission Manage is one of the biggest challenge, especially with the limitation implemented by Microsoft to protect their platform: • Items in lists and libraries Into this limitation, one important part is:

NOTE: When a list, library, or folder contains more than 100,000 items, you can't break permissions inheritance on the list, library, or folder. Nor can you re-inherit permissions on it. However, you can still break inheritance on the individual items within that list, library, or folder, up to the maximum number of unique permissions in the list or library (see the next section). Many folders from File Servers have much more than 100'000 items (files+folders) and you can forget to pre-configure your document library before run the file import process.

If you are face to this situation you will have the following when you are going in "Library Settings"

Going in Permission part of this settings:

When you are clicking on "Stop inheriting permissions", you will have that error message:

At this stage, we have no solution available and the text specifying the Administrator threshold is not pointing your company Administrator, but directly Microsoft. So there is no way to change that value.

But, there is a "Tip" to use if you know well the content you loaded (like using TreeSize or an equivalent). Because you can look into the original folder (from file server) what are the biggest sub-folders (with less than 50'000 items). In this case, the first 3 folders are containing more than 20'000 items, helping me to have less than this limitation:

So the solution is to go into your Document Library and select the specific folders one by one to delete it (or select many if you are sure to have less than 50'000 items as total):

When the deletion is completed, you can go in your Site Recycle Bin to control the presence of those deleted folders:

You can now go back into your Library Settings and control you have less than the limitation imposed by Microsoft:

You can now click on "Permissions" management link to disable the Permission inheritance on that Document Library:

When the permission set is correctly configured, you can go into the Recycle Bin, select your deleted folders and click on "Restore"

After a couple of minutes, you can come back into the library settings and review the Item Total number:

Your situation is now fixed and you can focus on the next problem.
reference pdf

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