"Create NAT64 Network" is missing in the Sharing options

Even I am also facing the same issue, followed each step properly as mentioned below, but I didn't find the NAT64 Network checkbox. 😟

Please suggest alternate to this..

To set up a local IPv6 Wi-Fi network using your Mac

1. Make sure your Mac is connected to the Internet, but not through Wi-Fi.
2. Launch System Preferences from your Dock, LaunchPad, or the Apple menu.
3. Press the Option key and click Sharing. Don’t release the Option key yet.Figure 10-7 Opening Sharing preferences
4. Select Internet Sharing in the list of sharing services.Figure 10-8 Configuring Internet sharing
5. Release the Option key.
6. Select the Create NAT64 Network checkbox.Figure 10-9 Enabling a local IPv6 NAT64 network
7. ........

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Issue reported by Apple: We discovered one or more bugs in your app when reviewed on iPad and iPhone running iOS 9.3.2 on Wi-Fi.

An activity indicator displayed when attempting to login. This displayed for over a minute. Once it disappeared, no login occurred and the login screen still displayed. We've attached screenshot(s) for your reference.

Next Steps

Please run your app on a device to identify the issue(s), then revise and resubmit your app for review.

Apps are reviewed on an IPv6 network. Please ensure that your app supports IPv6 networks, as IPv6 compatibility is required.

Please advice

Same issue here on MacOS Tahoe. This issue makes the official Apple guide from https://developer.apple.com/library/archive/documentation/NetworkingInternetWeb/Conceptual/NetworkingOverview/UnderstandingandPreparingfortheIPv6Transition/UnderstandingandPreparingfortheIPv6Transition.html#//apple_ref/doc/uid/TP40010220-CH213-SW16 outdated.

Woah, you just have to hold down the options key...See https://developer.apple.com/forums/thread/793878