While the Garmin Connect app is in the foreground (shown on the screen) it works but not when it is in the background.
I got it working by enabling
"Display pop-up windows while running in the background…
With thanks to @lgroth! I have a Pixel XL with settings navigation slightly different:
Settings | Apps & Notifcations | See all xxx apps | Connect | Advanced | Display over other apps | Display over…
For me : ..( Samsung A50 , Android 10 )
Go to/click on the Android settings wheel, then click on 'Apps' , then click on 'Connect ' app from the list of apps, scroll to the 'Advanced' section and choose /click on 'Appear on top ' then slide the 'Allow permission ' button.
Thanks, same works on my Xiaomi Redmi Note 9 Pro
That's good. Locking this old thread now.