To sign up successfully, you have to ensure that your manager has already added your phone and email into their account. You will only be able to sign up after they have registered your details.
Once you have downloaded your driver app, you have to SIGN UP (NOT LOGIN) your driver account. Once you have sign up an account, you will be able to login moving forward.
PLEASE ENSURE YOU SIGN UP USING THE SAME PHONE NUMBER OR EMAIL ADDRESS YOU HAVE PROVIDED YOUR MANAGER.