watchOS 8: Siri Shortcuts cannot be activated by voice

Question

• My watch app supports Siri intents and it works under watchOS 7
• Under watchOS 8, Siri Shortcuts execute fine when invoked by the Shortcuts app on the watch
• Problem: under watchOS 8, I get the following message after triggering the Siri Shortcuts using voice:

Answer 1

This solved the problem:

For the Siri Intent file: Make sure both the watch app and the Watch app extension is checked.