Go to Settings > Integrations and Keys, click New key, and search for Sharepoint. Select the item and click Continue.
In the Configure Sharepoint dialog, specify a key name and your Sharepoint Base URL, and click Save.
In the Integrations list, where your key is now included, click Authenticate.
Follow the instructions in the dialog to get your keys.
Enter the keys received as described above and click Save.
Now that you've configured your integration, add one or more of the integration's actions to an automation, test the automation, and then add the automation to an incident type.