ADH8066 Flow Control Enable

I can’t seem to enable flow control for my ADH8066. I’ve tried using the AT+IFC command to set the flow control, but it’s not acting like the manual states. Manual says possible setting for TE/TA and TA/TE are 0 and 1. +IFC won’t accept 0,1 or 1,1 or 1,0 but it will take 0,0 or 2,0 or 0,2 or 2,2 without giving me an error. None of the accepted settings seem to enable CTS0. Holding it low still sends responses, and holding it high still sends me responses. All I need is a way for my uC to tell it ‘it’s busy, don’t send it yet’, without XON and XOFF controlls. Am I changing the wrong setting? Please help.