Microsoft Sharepoint has multiple authentication flows that contain different permissions based on your use-case.
Non-admins may require admin consent in order to utilize full capabilities of the integration, such as write permissions. The linking flow provides 3 ways to authenticate. Here is what your customers see when they go through the linking flow for SharePoint:
Read-only permissions for non-admin users allows the integration to read all Files, Folders, and Drives that only you have access to. It does not allow the integration to access Groups, upload Files, and create Folders.
Note your administrator may still restrict you from consenting. Please contact your SharePoint administrator according to the guide here.
Read-only permissions allow the integration to read all the Files, Folders, and Drives in your Sites. It does not allow the integration to upload Files and create Folders.
Read & Write permissions allow the integration to read all the Files, Folders, and Drives in your Sites, as well as upload Files and create Folders.
Select the permissions option that fits your use case in Merge Link, which will redirect you to authenticate your SharePoint credentials to link your account!