It's not just you: it appears that Siri Shortcuts from Apple have not been working properly for some iPhone and iPad users since as early as Tuesday. 

A small but increasing numbers of users on Twitter and the MacRumors forums claim that they are unable to invoke shortcuts using Siri, including Federico Viticci of MacStories and Rene Ritchie of iMore. The shortcuts still work if executed directly from the Shortcuts app, but not with a Siri voice command. 

The issue is not affecting all users, nor is it affecting all apps. Third-party apps appear to be affected more than Apple's apps. It also doesn't appear to be related to today's release of iOS 12.1.1 (Link to MacRumors) or Shortcuts version 2.1.2 (Link to MacRumors). 

Apple seems to be aware and working on a fix.

The tragedy and triumph of Siri triggers being online services… https://t.co/k8c66OgZSX

— Rene Ritchie (@reneritchie) 5. december 2018

I’ve been editing an article all day. But yes, none of my Siri shortcuts are working at the moment and this pretty much sucks. https://t.co/uaqfSSzbXp

— Federico Viticci (@viticci) 5. december 2018

As with any cloud-based service interruption, Apple certainly has engineers working on a server-side fix. With the issue now receiving media attention, a fix shouldn't be far away. We'll update this article when it is implemented. In the meantime, some users have been able to re-record their Siri Shortcuts phrases to get them working again. To do so, open the Shortcuts app, tap on the three dots on a shortcut, tap on the settings toggle icon below Done in the top-right corner, tap on Siri Phrase, and tap Re-Record Phrase.

Source: MacRumors, Twitter and MacRumors Forums