There's a long-standing bug in the draft workflow editor. You can't add transitions to steps that don't already have one outgoing transition.
You will need to copy your workflow to one with a new name, and edit that. The inactive workflow editor allows you to add transitions to any step, no matter what. Once you've added it (and made other changes you want), save the new workflow and then go into the workflow schemes and swap the old one for the new one.
For JSM June Challenge #2, share how your non-technical teams like HR, legal, marketing, finance, and beyond started using Jira Service Management! Tell us: Did they ask to start using it or...
Connect with like-minded Atlassian users at free events near you!Find an event
Connect with like-minded Atlassian users at free events near you!
Unfortunately there are no Community Events near you at the moment.Host an event
You're one step closer to meeting fellow Atlassian users at your local event. Learn more about Community Events