STEP 1 :

The first step is to obtain Secret ID and Application (client) ID. For this we need create an application on Azure portal. For that open the below link and search App Registration.

Home - Microsoft Azure 

you will be asked to login, please login with your microsoft account credentials.

STEP 2 :

Open App registrations and click on New Registrations.

A new window will appear, fill in the details in here as shown below. you can give name as per your liking.

Select account type as shown in screenshot below and give a rediredt URI as per your environment,

https://<your env here>/OneDriveConnector_Reactive/OneDriveOAuthCallback

After this click on Register button.

STEP 3 :

Copy the Application (client) ID from the screen and paste it in Site variable of the connector.

Next to obtain secret ID click on the client credentials link,

Now click on new Client secret and copy the Secret ID in the Site variable of the Connector.

Now we have both client ID and secret ID. Next step is to give permissions.

STEP 4 :

Click on API Permissions,

Now click on Add Permissions and then on Microsoft Graph and then on Delegated permissions, here search File and give all permissions related to file, next search API Connectors and give all permissions related to it.

Don't forget to click on Add permissions button.

STEP 5 : 

There is no step 5 you are all set for using the OneDriveConnector.