There are 2 common reasons that users get the Contact Not Found error message.
- Contact is not in the database
- User is not on a LinkedIn profile page
Let me dive into that some more"
Not all contacts are available in the database.
This is not uncommon, in fact many contact providers claim to have contact data that they sell you, then you scrub the data with a 3rd party (IE Neverbounce) only to find some of the data you have purchased is not accurate and un-useable.