Hello,
Welcome to the Apple Support Community.
A simple solution would be to check to see if there are any errors within the shortcut. If this is not the case, you might want to copy the iCloud link. To do this: Open the Shortcuts app > Click the three dots next to the desired shortcut > Go to Shortcut Settings > Scroll down to Share > Click on Share and look for Copy iCloud link.
After you have done this, paste the link somewhere where you can click on it later. Then, delete the Shortcut and click on the link to read it to your library. Then try running the shortcut again.
Another option would be to try and reconnect your iPhone and your Apple Watch. Then try running the shortcut again.
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If the problem persist, pleas do not hesitate to contact me here again.
Cheers!