Why can’t I do ECG on the Apple Watch SE?!?!?

Your misunderstanding something,my apple watch 4,5 and 6 all have the ECG app.

Read this;

Taking an ECG with the ECG app on Apple Watch

Are you in a region that supports it?.

Countries that support ECG app

ECG isn’t supported on Apple Watch SE, only the Apple Watch series 6 supports ECG.

ECG is for apple watch 4 and above.

I use an Apple Watch se and it does not have ECG, the series 6 does. Unless I’m misunderstanding something.

Yup my bad, i thought the series 6 only had it.