I fixed mine by side loading the APK. https://www.apkmirror.com/apk/samsung-electronics-co-ltd/samsung-pay-watch-plug-in/samsung-pay-watch-plug-in-1-7-5606-release/samsung-pay-watch-plug-in-1-7-5606-android-apk-download/ Had to do this same thing with my Pixel 3. I just loaded it and Sammy Pay works on my new S10. Geez Louise Samsung..... GET IT TOGETHER
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