Agile dev team says the cost is already fixed due to a fixed number of developers, so either scope or deadline shall remain flexible.
Marketing team whats to launch a promotion campaign with a specific release date aimed at current customers before the release with details as to what the new to-be-released extra features entail and how adding them is beneficial for the current customers.
So marketing wants to make promises to customers, but the agile team only wants to promise either scope or deadline.
This conflict is an endless forth-and-back and comes up every time that a new version has new major features in them.
Obviously, we also don't want to have a finished version sitting there for three or so weeks just so that marketing can do their promotional campaign before release.
How can management approach this issue so both parties can be satisfied and development and promotion can work in parallel?