You may use a workflow condition to prevent an issue from being transitioned until a sign off step meets a specific requirement. For your chosen workflow, select a transition and choose conditions. Add a new condition named Signed Off Steps Condition.
You may then choose the sign off steps to apply the condition to, and the required status. You may select all steps, or a specific step.
You may add this condition as many times as you like for different steps. If you add the condition multiple times for the same step, you may accidentally create a condition that can never be met.
If a sign off step isn’t applicable for a given issue (because the step is only available in certain projects or for certain issue types) the condition will not apply to that issue.