Garmin Connect & Apple Health Fix!
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For those who cannot find Garmin Connect (Mobile App) in the list of sources in Apple Health please try the below fix.
1) Sign out of your account on Garmin Connect. (More > Settings > Sign Out)
2) Force Close Garmin Connect and Apple Health apps.
2) Delete the Garmin Connect App and then re-download it.
3) Open Garmin Connect - However, instead of signing-in using your existing account, create a new account.
4) Skip Device Setup until you are at the screen that asks what you want to mainly use the Garmin Connect app for.
5) Only choose only ‘Health’ option. The Apple Health app then pops up and links to your Apple Health account.
6) Sign out of the newly created Garmin account (More > Settings > Sign Out)
7) Now... sign back into your older existing Garmin Connect account.
This fix works for me and does not require any further deletion/re-installation of the Garmin Connect app.
iPhone 6, iOS 11.4.1