Guest who open the My Disney Experience app and click the virtual queue button will get a in app push notification that Star Wars: Rise Of The Resistance will not be operating today. Below is the in app notification that guests received:

Guests who were in park received another notification from the Vice President of Disney’s Hollywood Studios apologising for the inconvenience. Below is what this in park push notifications said:
On Behalf of the entire team at Disney’s Hollywood Studios. I’d like to apologise that Star Wars Rise Of The Resistance is unavailable today.Our cast members have been working dilligently to get the attraction up and running again, and we are sorry you are not able to experience this attraction on your visit. I hope you will enjoy some of our other attractions during your experience in the park today.
Jackie Swisher
Vice President Of Disney’s Hollywood Studios