I have filled in all the options for my build pipeline and there no error messages. How do I go about finding out why the Save button is disabled?
I had the same problem and it was because I didn't have sufficient permissions for the project.
Once I was given permissions, I had to leave the 'create pipeline editor' and then create a new one and now the 'Save & Queue' option is enabled along with all the other fields.
This seems like an Azure bug. They let you into the Pipeline editor when you shouldn't have access to it via the plus icon next to the Project Name as seen in the image. After you enable permissions and click on 'Pipeline' (left nav), you are presented with a UI for creating pipelines that wasn't there before. Before getting permissions, you are presented with a blank screen when clicking on Pipeline.
If I go to Triggers on the top menu then I can see some settings need attention under Continuous Integration.
The little red error icon is actually visible against the word trigger in my screen shot.
"You must add at least one branch filter."
Once I add a branch filter the save button enables.