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How do I add a SP group with existing permissions to an item.

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Posted on by Spawn10

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I have a SharePoint group that already has it's permissions levels defined. I want to add this group (with it's existing permissions) to a SharePoint list item. In my flow, I am using a Send an HTTP request to SharePoint action to try to accomplish this using the api...

_api/web/lists/getbytitle('My SharePoint List')/items(@{triggerOutputs()?['body/ID']})/roleassignments/addroleassignmentwithroledefinitionbinding(principalid=@{variables('GroupId'))

This is currently giving the error.... "Cannot find resource for the request addroleassignmentwithroledefinitionbinding."

Has anyone else tried this? How do I go about resolving this error?

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David_MA 14,614 Super User 2026 Season 1 on at

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Maybe I am misreading your post, but if the SharePoint group already has existing permissions to the item, why do you need to grant the group permission to the item? Do you want to add another SharePoint group? If so, you can use these actions to change permissions on an item:

The grant access action allows you to choose a group in the recipients' field. This works with only M365 groups. If you created a legacy SharePoint permissions group, that cannot be done with these actions.

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Kalathiya 2,135 Super User 2026 Season 1 on at

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Hello @Spawn10,

This error usually occurs because the REST endpoint being called isn’t valid.

To assign permissions to a list item, you first need to break the item’s permission inheritance (if it hasn’t been done already):

_api/web/lists/getByTitle('[LIST_TITLE]')/breakroleinheritance(copyRoleAssignments=true, clearSubscopes=true)

Add the role assignment using below end point:

_api/web/lists/getbytitle('My SharePoint List')/items(@{triggerOutputs()?['body/ID']})/roleassignments/addroleassignment(principalid=@{variables('GroupId')}, roledefid=1073741830) //1073741830 - Edit permission role definition id.

principalid is the ID of the SharePoint group.

roledefid is the ID of the permission level you want to assign (e.g., Contribute, Read, etc.).

For more details, you can follow this blog:

https://www.c-sharpcorner.com/article/power-automate-break-inheritance-and-set-list-item-level-permissions-in-sharep/

If this response resolves your issue, please mark it as the Verified Answer so it can help other community members as well.

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