To have the shortcut added to the Shortcuts app on install, you must include the app name in the shortcut phrase. Otherwise the shortcut must be added manually. A bit on the kludgy side IMHO, the app name could be a separate property...
The "Dive Into App Shortcuts" video explains this briefly. They use the interpolated method of adding the app name a la: "(.applicationName) the rest of the shortcut phrase". And if you have more than one phrase they all must have the app name embedded.
HTH
Topic:
App & System Services
SubTopic:
General
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