I am trying to achieve something similar to this: Break inheritance on a folder using REST below but at a level that is one deeper.

I can successfully break inheritance on a Document Set each time a new one gets added to my document library using the following REST call, as per the above answer:


I can then apply successfully any new permissions that are necessary by making calls in the following format, all well and good:


However there is also a sub folder that gets created underneath the document set that I need to modify the permissions on as follows (this doesn't work but highlights what I am trying to achieve):

https://sites/mysite/_api/web/GetFolderByServerRelativeUrl('/sites/mysite/DocLib/DocumentSetName/My Sub Folder')/ListItemAllFields/breakroleinheritance(copyRoleAssignments=true)

https://sites/mysite/_api/Web/GetFolderByServerRelativeUrl('/sites/mysite/DocLib/DocumentSetName/My Sub Folder')/ListItemAllFields/RoleAssignments/AddRoleAssignment(principalid='XXX',roledefid='1073741826')

I can break inheritance and change the unique permissions on the /DocLib/DocumentSetName/My Sub Folder through the UI so I am fairly sure I should be able to do this via REST but am not able to figure out the correct call to make. Searching about hasn't revealed much on this.

UPDATE: If I just have a folder structure in the document library such as DocLib/Folder/My Sub Folder I am able to change the permissions on the /My Sub Folder as expected by using the calls above.


  • What are you using jQuery ajax or Javascript fetch method? It does not seem you have tried it.
    – Imir Hoxha
    Commented Apr 13, 2021 at 13:24

2 Answers 2


Try this: You have to use the POST METHOD in both cases:


  • Sorry, I should have mentioned that I was using the POST method to make these calls
    – Bob
    Commented Apr 13, 2021 at 13:31
  • Use the rest api end points above and it should work. Provide the correct user/group Id in the principal property
    – Imir Hoxha
    Commented Apr 13, 2021 at 13:35

After some further testing, it turns out that I wasn't looking in the correct place when looking at the permissions for the sub folder. Quack quack.

I was trying to see who was assigned by using the Permissions button in the ribbon for the given document set sub folder:

enter image description here

When in actual fact I needed to use the Shared With item in the drop down for the sub folder:

enter image description here

It was working as expected all along.

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