Wildfires caused by global climate change are an increasing problem and require applying a comprehensive global fire prevention strategy. To support these efforts, a SILVANUS project has been established with more than 50 parties engaged. However, such a large-scale initiative introduces complexity of collaboration and architecture, so introducing any security-related processes and components is challenging, including identity and access management ones. In this paper, we continue the efforts on building a robust and efficient identity and access management architecture (IAM). As both the platform and IAM architecture are distributed with scattered components across a wide geographical area, including regions with limited connectivity, we wanted to verify if certain aspects of synchronization are going to work properly in such a demanding environment. We build the test environment to simulate real-world challenges and propose two approaches for ensuring the IAM components are synchronized. The conducted tests confirm the feasibility of the proposed solutions as well as their robustness and efficiency.