Orbi Access Control Not Working Properly (since FW update?)

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Stev3D wrote:

Since I got my Orbi RBK50 (RBR50 router with RBS50 satellite) well over a year ago, I've been using Access Control set to "Block all new devices from connecting" until I specifically approve.  Last week (after applying the 2.3.1.60 firmnware update) I added a new device, and today another new device.  I have explicitely approved them using the iOS app, and the browser-based interface.  For some reason, their approval is spontantaneously changing from "Allowed" to "Blocked."  Router reboot makes no difference.  

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Could you please describe how the devices were added using the browser-based interface?  My assumption is that the process is to open the Advanced Tab->Security->Access Control page, scroll down to the area "List of allowed devices not currently connected to the network", click on the "Add" button, and enter the device MAC address and some "name."  Then click "Apply" to have the changes made permanent.  Correct?

I confess to not having extensive experience with Access Control.  My pattern has been to turn off Access Control, let things get connected (I often assign IP addresses to them), and then after they have appeared in the table as "Allowed", I turn on Access Control.  (and click that damn Apply button!)