How do we ensure that our product messaging resonates with the overarching company strategy and sales goals?

First, be sure that you know the company strategy and sales goals, and actively partner with the folks setting those. They should be part of creating or validating the messaging. If messaging is entirely a siloed activity, then it probably won't resonate.

Monitor usage of the materials where your messaging appears -- website, pitch decks, one-pagers, training documents, etc. Are you hearing it pop up in sales calls? Organic usage of messaging is a great sign.

Or is everyone saying entirely different things and creating their own materials for every meetings? Those would be signs that your messaging isn't resonating (or that there's a training opp).