The Harmonization Emergence Model emphasizes that the emergence of a ‘real’ team with truly interdependent members, hinges on their ability to co-create 'Stimmigkeit' or Congruent Shared Meaning, which is an effective shared cognitive representation of the external environment. This increases the likelihood that a team's engagement in languaging would yield the intended effects. In this paper, we explore the effect of using a foreign language (L2) on team members’ ability to engage in participatory sense making (PSM) to reach congruent shared meaning. The study is based on the self-assessments of 31 participants during a multinational exercise as part of the Joint Advanced Command and Staff Programme (JACS-P) at the Swedish Defence University (SEDU). It explores participants own reflections on their ability to mediate information and to engage participatory discourses when sense-making. It concludes that the participants’ ability to develop a nuanced shared meaning or model of the external environment is constrained when using an L2. We suggest that in multilingual contexts a 'Constructive-Decoherence Approach' could be used. This would allow team members to use of their first (L1) language in the sense-making process, enabling a deeper and more nuanced analysis of the situation, while simultaneously facilitating the integration necessary in multinational or multicultural organizational efforts.