Albert, thanks for the reply.
Remote hosted Live Activities I believe is a iOS 26.x system feature → No developer adoption.
My steps:
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Preparation: Make sure iPhone and Mac (and/or Watch) are signed in with the same AppleID
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New iOS Project
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New Widget target, using standard template (In the new target UI also check that you want the live activity)
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Build and run to a physical iPhone
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Notice Live Activity exists on iPhone, Mac and Apple Watch
[Example: From macOS, iOS Live Activity appears]

In this case, I haven't built for any other platforms at all. I believe this is a feature, but I'm attempting to understand what I need to do to make it stop showing up in places that don't make sense for this app.
Just made a simple project using the Xcode templates provided, then start the live activity on app launch.
https://github.com/ioloro/LiveActivityWillTravel
Thanks,
John Marc