You have the ability within TIDY to not only bid on confirmed times, but also to request to be a standby for jobs. Being a standby is a great way to earn more and get more clients. Here is how it works:
If you are not needed for a standby job, you will see the message before being able to mark "I've Arrived" or "Start Job". If you are trying to mark "I've Arrived", and the app is saying you were cancelled, you were cancelled.
Note: Some standbys have asked if they can do a job instead of the regularly assigned pro since they are nearby, or already went to the location. The answer is that we don't have a way of supporting it at this time, the client would have to do this change. At this time we don't have a way technically to "take" a job from the regularly assigned pro.
We find that standby jobs allow pros to pick up business from others who are less reliable than you, and also earn some cancellation fees if it doesn't work out. It's a win for you, and a win for the client.