Hello @PawanKumarR
You have to break down your requirement into multiple parts and to begin with, I would encourage you to start learning about SharePoint and ServiceNow integration.
Recently, I believe Microsoft made their apps to be integrated within their ecosystem i.e you have to integrate ServiceNow with Microsoft Azure app (you need to check with your employer’s cloud team to create one or share existing with you) which will have allowed API connection to Microsoft Graph with required read and write permissions.
Once the above is figured our then you can create an outbound rest message from ServiceNow to Microsoft graph endpoint to make HTTPS calls like GET and POST.
Good Luck and Happy Learning!
Hope that helps!
