I updated my S9 this morning to Android Pie and my case did not work. Turned it Off and On again and now it is working as before.
Case is the Samsung LED Display View Flip Wallet P/N: EF-NG960PBEGWW
Since Pie update all functionality of the covers stopped. Even the accessories option is removed from settings.
I have a clear view cover that was working perfectly fine since I got it. But now it's just a piece of trash. Through my search online I can tell you it's a bug in the Pie update. One that we don't even know when it's gonna be sorted out.
I talked with Samsung customer support, they told me they removed case sensor options in new update so case is not working. We have to wait for new update.
Why they turn it off? Will they really fix it? That is frustrating