I am a new user on the Apple watch 6. The ECG and Blood Oxygen show that it is not available under the Health checklist within the Health app. It is also not available at the app store on the watch it self.
Is iOS 14.4 installed on your iPhone?
Is watchOS 7.3 installed on your Watch?
If not, first update your devices(s).
Make sure your Settings > General > Language & Region are set correctly.
Still no joy, the Watch may be imported from overseas.
Check iPhone's Watch app > My Watch > General > About > Model > tap here to see number starting with A????
Compare it with this link => Identify your Apple Watch - Apple Support
Tell us where you are using the Apple Watch?
And which country was the Apple Watch bought?
The options are not available everywhere.
See country list that support ECG => watchOS - Feature Availability - Apple
And Blood O2 => watchOS - Feature Availability - Apple
Note: Blood Oxygen app is not supported on an Apple Watch SE
In South Africa. Dis see that South Africa do appear on the list of countries where it is available.
But you didn't buy Watch in South Africa, did you?
The options depended on
The watch was bought in South Africa and used in South Africa. Got it when purchased with my phone at a legal shop! MTN is one of the distributors of apple products in South Africa!!!!!
Thank you. Set the region to mirror my iphone and sorted out!
You're welcome, enjoy.