See my reply here: https://us.community.samsung.com/t5/Galaxy-S9/Incessant-Find-My-Mobile-notification-PLEASE-MAKE-IT-STOP/m-p/1650574#M45014
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I found that if you just turn it on/accept it, and then immediately turn it off again, the notifications go away. (There is an on/off toggle in settings, which you can find by searching Find My Phone.)
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