All co-workers need their own user in Moment.
Create new user
Go to Co-workers.
Select +New co-worker.
Enter the co-worker's Email. The email address is unique for each user. Use an email which hasn't been registered in Moment earlier.
Enter First name, Last name, and Mobile phone. Please note that phone number is required in order to receive the text message with the login code.
Choose if the user is an Internal or External co-worker.
Select Register new co-worker.
Please note that the user is created without any access rights. You can change this by editing the user's settings.