This process must be completed by a NetSuite Administrator.
The SuperSync Email for Outlook Configuration record contains your organization's Login Token.
You'll need to copy the token and share it with the people in your organization who'll have access to the add-in.
Access the Login Token in NetSuite:
Go to Customization → List, Records & Fields → Record Types, click on List to the right of the SuperSync Email Configuration record. You'll find the Login Token on the subsequent page.
Access the Login Token in SuperSync:
Log in to your SuperSync account at supersync.cloud.
Click on Integrations, then click on My Integrations.
Look for the Outlook 
NetSuite integration and click on the Expand button.
To reveal your Login Token, click the Show button.
