Government policies supporting the Sustainable Development Goals (SDGs) and sustainability criteria, as well as commercial goals, aim at an enabling multi‐actor environment. However, they do not prevent friction, lack of mutual understanding and cultural clashes with the private sector. We argue that this relational issue is a considerable and relatively neglected concern, albeit readily recognized by practitioners, and is potentially obstructing the achievement of the United Nations’ 2030 Agenda and the SDGs. It also deserves more scholarly attention. In articulating and discussing public–private relations, in this exploratory project we point to a theoretical challenge that touches on the ontological and epistemological core of international studies. Apart from analysing relevant literatures, we have benefited from varied data collection with input from policy makers, diplomats, business representatives and consulted experts across cultures. Our starting point is that public–private partnerships that are necessary to reach the targets of the UN's 2030 Agenda pose a test for ministries of foreign affairs (MFAs). These new kinds of SDG partnerships differ from early 21st‐century public–private partnerships (PPPs) in the field of development cooperation. Leaving aside risk factors facing companies in our research, we identify three main SDG partnership puzzles for government.