I am having the same problem. Even though the keyboard seems like is already designed for multiple OS.
I noticed that on the letter Q there is a function label says “for Android” and under W “for Win” and on the letter E “for iOS” Can someone in these forum please tell us how to use those special function keys. May the BT keyboard is already designed for multiple OS pairing mode, so one does not have to remove the pair and re-pairing each time he switch the operating operating system.