unable to provide consent

Question

Hi All,

I am facing an issue with API permissions. I have an Azure App Registration with the following Microsoft Graph API permissions. Let's say the App Registration name is TESTAPP and the Client ID is xxxx-xxxx-xxxxx-xxxxx.

I have a SharePoint site, let's say mysite1, and I am trying to provide permissions in the following way: 
I obtained the site ID using the following URL: 

https://mydomain.sharepoint.com/sites/mysite1/_api/site/id. Let's say the site ID i got is 
11111-111-1111-11221

i have logged into https://developer.microsoft.com/en-us/graph/graph-explorer/

Post-->v1.0-->https://grapsh.microsoft.com/v1.0/sites/{11111-111-1111-11221}/permissions

Request headers: Key:application/json

Request Body:
{
    "roles": [
        "write"
    ],
    "grantedToIdentities": [
        {
            "application": {
                "id": "xxxx-xxxx-xxxxx-xxxxx", # This is my app regisration id
                "displayName": "TESTAPP"
            }
        }
    ]
}


When i click modify permissions and search for sites permissions, i am unable to provide consent, its grayed out. I am a global admin and i have full access on the SharePoint site. Please guide me.

Answer 1

It might be less complex todo if you use PNP Powershell to configure this.

Check out the "Granting permissions via PnP PowerShell" section of the following Learn page: https://learn.microsoft.com/en-us/sharepoint/dev/sp-add-ins-modernize/understanding-rsc-for-msgraph-and-sharepoint-online#granting-permissions-via-pnp-powershell