On the 3rd and 4th of October 2024, the SUN training took place in Barcelona, attended by a representative from the SIRIUS network and ERDISC research team at the Universitat Autònoma de Barcelona. Participants from various organisations, such as the Catalan Commission for Refugee Aid (Spain), Foundation for Access to Rights (Bulgaria), NIDOS (Netherlands), Association for the Social Support of Youth (Greece), Voluntarius (Italy), and Terre des Hommes (Romania) came together to exchange knowledge on safeguarding unaccompanied and separated children’s rights. Topics covered included statistical overviews, the asylum-seeking process, key challenges in various EU countries, the EU Charter of Fundamental Rights application, and a “train-the-trainer” module to disseminate the project’s outcomes. This report seeks to reflect on the training’s objectives, content, and potential application of the knowledge gained within the context of Catalunya.