How do you work with sales, product or other teams as a marketer?

The friction is usually with sales, so address that directly.

• Agree what a qualified lead means, in writing. Most marketing-sales conflict comes from marketing being measured on lead volume and sales being measured on closed revenue. A shared definition, and a shared target further down the funnel, aligns the incentives.
• Close the feedback loop. Sales knows which leads were useless and why. Without that feedback marketing optimises towards the wrong thing indefinitely.
• Listen to sales calls. The language customers use, the objections they raise, and what actually persuades them is the best source of messaging there is — better than any brief.
• With product, bring evidence of what customers ask for and where they struggle, and take realistic timelines back rather than promising features in campaigns.

Note: A strong specific example: introducing a regular pipeline review with sales, or a shared dashboard both teams look at. Structural fixes to collaboration are far more convincing than saying you communicate well.