Make sure the Web Services subscription is turned on

Click on the + next to Web Services Users.

Name the User ID "follow-up-crm". This will be the username to be used while integrating in FollowUp.

Fill in the rest of the details and select User Type as "Business"

Authorize and the Web Services user is now created

Check the email inbox associated with the email entered while creating the webservices user for the Password, to be used while integrating in FollowUp. 

How to create a Web Services User on Sage Intacct for FollowUp