Resend an Invitation to Collaborate
From Companies, open the company (hint: you can use the filters to select all companies that have been invited but have not accepted the invitation).
An exclamation point (!) will appear next to every company that has not accepted their invite.
Under the company name, click Resend Invitation.
This will send a new collaboration invitation email to the primary contact listed for the company.
Invitations expire after 14 days so be sure to keep in contact with your client or contractor to ensure they accept the invite.