LenoxSoft is setting up a brand new Marketing Cloud Account Engagement business unit.

Change each user's profile in Salesforce to the System Administrator role, which will create them as Administrator users in Marketing Cloud Account Engagement.

Provide each user with a unique activation link to create their own Administrator user records in Marketing Cloud Account Engagement.

Import the users into Marketing Cloud Account Engagement and select the Administrator role on their Marketing Cloud Account Engagement user records.

Add users to the Marketing Users group from Marketing Setup in Salesforce and map their user profiles to the Administrator roles.