Hello,
these topic exists already, but it is closed:
I have the same problem. I've bought the Mac Power License and the iOS Remote app. My Mac and my iPhone are up to date. I've followed the instructions and the troubleshoot article, but on the iPhone it still does not show the passphrase and there doesn't pops up any macOS dialogue to allow Alfred the remote settings.
Both devices are on the same network.
Both devices are rebooted twice.
Is there anybody with the same problem and has it already solved?