Tokens in Sales Insights

Hi Everyone,

We are using a set of emails with Sales Insights in Salesforce, and the emails have tokens for First Name. When we've sent tests, as in an actualy email to say myself, the first name doesn't populate. It's just the {{lead.First Name:default=Hello}}. Should the token be pulling in the contact's name or does the person sending the email need to put their name in if they see fit? Is that just something that's standard from sending emails from the Sales Insights?