There can be several reasons why a new user did not accept the invite to join your organization.
To determine if a new user did not accept your invite:
- Click Organization Settings from the top right menu
- Go to the Users tab
- Any users who did not accept their invite will be listed with an "Invited On" date in red letters under their email address
Best course of action is to resend them an invite.
- On the Users tab, click the Delete icon next to the user who did not accept invite
- Re-add them by clicking Invite User button on top of that page
- Type their email address on the User Email field
- Click Save button
User will be listed with a new "Invited On" date.