802.11w Management Frame Protection provides additional security measures for management frames. Not all client devices support 802.11w.
Check your client devices before enabling 11w. If “Required” is selected, clients must support 11w in order to connect. If “Capable” is selected, clients with or without 11w should be able to connect. However, note that some clients with poor driver software may have connection problems even if 11w is set to Capable.