Samsung promoted the Galaxy Watch Active 2 as a health-focused wearable that would rival the Apple Watch series thanks to its in-built medical-grade electrocardiography (ECG). However, the function was disabled at its launch. This is not the case any more; however, German and Austrian users are reportedly still waiting for their access to this feature.
https://www.notebookcheck.net/Galaxy-Watch-Active-2-Nearly-two-months-on-the-ECG-tracking-function-has-yet-to-reach-users-in-various-markets.481709.0.html