What does it mean when the invitation status shows red [Link Expired] on Connection Management or the buyer list?

It means the invitation was sent (or last refreshed) more than 14 days ago and the other party has not yet accepted it. The invitation link has now expired; when the other party clicks the link they will see "Invitation link has expired". How to handle it: Press [Refresh Link] on that entry (on Connection Management, it's the refresh icon next to [Copy Invitation Link]; on the buyer/seller detail page, it's at the top of the page). The system will not send an email. It will reset the expiration period to 14 days from now and automatically copy the link. Since the URL doesn't change, you can also ask the other party to click the original link again. If you want the system to send a reminder email to the other party, press [Resend Invitation]. This badge appears in [Outgoing Invitation History] in Connection Management, and in the list and detail pages of Buyer Management and Seller Management. The dates on the buyer/seller pages are recorded only to the day, so the badge may appear up to one day after the actual expiration.