Pendo Reseller Adopt invites have a time limit associated for security. Invites expire after 72 hours (3 days). Any Reseller Adopt "Subscription Admin" can re-invite the user by clicking the "Invite User" button on the Users page and adding the details again.
Note: If a user is already a member of a Reseller Adopt account, they don't receive another email invitation. The new account automatically appears in the Reseller Adopt UI.