No. Whenever you assign a card to an employee, the employee automatically becomes a member to your Emburse account.
Owners, admins, or reviewers with spending authorization privileges can click Assign Card to enter in a name and email address. If the email address entered isn't already a member your account, this will invite the person to join your account.
The invited person will receive an email with instructions to set a password and register to login to your Emburse account.