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I was able to get to the sign up page for Samsung Care+ through Samsung Members app. It ends up routing to a web page where my IMEI is populated. I haven't signed up but it's available if I want to.
1. Open Samsung Members App
2. "Explore" tab
3. Tap "Benefits" filter or the "Benefits" card
4. Tap the Samsung Care+ card
5. Tap "Buy NOW" button
Arrive at web page with IMEI number populated asking for purchase date.
Notice shared from Samsung chat rep.