Apple Watch series 8
When I try to open my Blood Oxygen app my watch displays “Data Not Linked to You”. Where do I activate this “data link”?
Apple Watch Series 8
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First check it is available in your country
watchOS - Feature Availability - Apple
Make sure your watch is paired to your iphone and not another family member's iphone.
The article you came to the community from How to use the Blood Oxygen app on Apple Watch - Apple Support is the best resource for this situation. If you've completed that troubleshooting and the issue is still not resolved, use the link in the article to Contact Support.
Click here > Contact - Official Apple Support
or phone numbers
Click here > Contact Apple for support and service - Apple Support