This webinar outlines the critical necessity of interoperability within digital identity systems to overcome the inefficiencies of fragmented national frameworks. It highlights how the transition to eIDAS 2.0 establishes a unified legal and technical basis for cross-border authentication, ensuring that digital signatures and identity wallets carry equal legal weight across different jurisdictions. By mandating standardised security requirements and certification processes, these reforms eliminate administrative hurdles and strengthen legal certainty for high-stakes sectors like finance and healthcare. This harmonised approach facilitates labour mobility and international trade by allowing citizens to manage their credentials through a secure, portable European Digital Identity Wallet. Ultimately, the document presents universal identity compatibility as a strategic investment that bolsters economic competitiveness, public sector productivity, and modern digital security.