We've updated our invite system to work better for teams.
First, we've added the ability to invite multiple team members at once by creating a custom invite link. From the organization members page, just click on "Create invite link" to generate a special invite link which is valid for up to three days.
We've also fixed a few bugs with signing up by invite, so everything should be working much better now.
Thanks for sending us feedback and bug reports about invites! We hope you can now easily invite your whole team.