I went through the whitelist process (they asked for the MAC ID that can be found in device info) and airplay casting is actually back on. I’m not sure what their workaround is but mine is now working.It may be a little late (I just saw this thread), but in the attachment in the first post it states that you can contact WiiM to add your device to a whitelist to retain the feature. If your WiiM already has been updated, though, you may be out of luck.