The user mentioned "work". Maybe they're having issues with the license key not working? Or maybe they want to see if the key works for another machine or after a certain period? Or perhaps they bought a key from a third party and want to check its validity.

I should also consider that the license key might have expired. Some keys have a time limit, especially trial versions. They might need to renew or purchase a new license.

Potential questions from the user: How to activate the key? How to check its validity? What to do if activation fails? But since they didn't specify all that, I should cover the most common issues.

Another angle: the user might need assistance generating a key, which is against their policies. I need to remind them about the terms of service and legal use. Also, maybe they want to apply the key on a machine but it's not working. In that case, suggest contacting Faronics support, checking online activation, or looking for user guides.

First, I need to check if there's a 856 license. Let me think... I remember license keys for Faronics products usually follow a specific format, maybe alphanumeric, with a certain number of segments. The 856 could be a version number or part of the license code.

Also, if the key is for a different version (like Standard vs. Enterprise), it might not work. So checking the product version is important. Maybe the user installed the wrong edition.