You'll want to be sure that the email address you're sharing the item to is the correct email address for their LastPass account. We would also recommend having them copy and paste their LastPass email directly from their LastPass Account Settings (by going to their Vault then clicking Account Settings at the left side of the Vault page.) then having you send the Share to that exact email.
RachelO is a member of the LogMeIn Community Care Team.
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