You will need to set the Z9 into pairing mode before your iPhone will find it.
The manual for the z9 is
hereWith the Z9 OFF, Press and Hold the MFB for about 6 seconds. The LED will appear a solid Blue, and then will start flashing. The Z9 is now in Pairing mode and ready to be found in searches by other Bluetooth devices. Pairing mode will be active for 2 minutes.
Enter Passkey "0000" when your phone prompts you. The phone and Z9 will now Pair.
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