I've just done the same to uninstall restart my phone and reinstall but still no Deezer. On checking the version in the Google play store, shows the last update to the app was 8th March 2021 v11.17.0-210305.
I'm having the same issue too. I used to have the option to open in Deezer but this has now gone. Tried uninstalling both apps and reinstalling..Still no Deezer options. I have recently updated to android 11 and oneUI 3.0 on my S10.
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