CoreTrustSeal (CTS) Certification has become the "go to" certification for research data repositories worldwide. In 2020, Scholars Portal, the operations division of OCUL, knew that certifying their Dataverse repository was an important aspect of its continued growth and success across Canada. Scholars Portal officially launched their project to become CTS certified in January of 2021. Scholars Portal Dataverse is slightly unique as the software and infrastructure are centrally managed, but each participating post-secondary institution is responsible for managing their individual collections, including the creation and implementation of institutional-specific policies and procedures. This setup has a considerable impact on the CTS certification application procedure, and what the various parties involved are responsible for. As CTS certification is not yet set up to differentiate between specialist repositories, generalist repositories, and technical repository service providers, Scholars Portal needed to develop an application method that would allow participating institutions to apply for certification while also satisfying CTS requirements. The end result was the Scholars Portal Dataverse CTS Certification Cohort; a group of participating institutions interested in pursuing CTS certification collaboratively. This presentation will provide an overview of the Scholars Portal Dataverse CTS Certification project, with a specific focus on the development and collaboration of the Cohort. This overview will also introduce the methods used by Scholars Portal to assess the gaps between needed and existing policies and procedures, as well as the methods used to determine the responsible party (i.e., Scholars Portal vs. Participating institutions) for each gap. The presentation will also introduce additional collaborations between Scholars Portal and both the Dataverse North Policy Working Group and the Digital Research Alliance of Canada.