How do I invite someone who created their own account already?

If someone who you want to add your company account already created their own company trial account, you can not invite them automatically to your account. The reason is that each e-mail can be only under one company account at any time.

We can move the user manually from one account though. To do that, contact Weekdone support at stating who you want to move and under which account. You can also give this request via the live chat feature in our site lower right corner.