blood oxygen app does not show a start button
All of the instructions I find does not show you the app icon. I am sure the one I have is it but it only wants me to input data.
Apple Watch
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First, make sure you meet ALL there requirements in the 'Here's what you need' section of;
How to use the Blood Oxygen app on Apple Watch Series 6 - Apple Support
Then continue following the rest of the steps in that link.