I have 4 Radeon Rx560's. When I open the Radeon Settings and navigate to global settings I can only see 3 video cards. All 4 are working. The problem is I can't set number 4 to compute instead of graphics because it doesn't show up.
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Does all your GPU cards show up in Device Manager? If it shows all but one, Try manually updating the driver through Properties from the one that doesn't show by directing it to the C:\AMD folder that was generated when you installed the Adrenaline set.
Found this Youtube link about installing drivers in Windows 10 mining rig. I don't if it will help you in this case.: RX570 / RX580 6+ GPU AMD Driver Fix for Windows 10 - YouTube
The card in question is showing up in both afterburner and device manager. It mines crypto as well, but only at half the rate of the other cards. I will update thread with more info later. Thanks