Summary

Under Sprints details > Member’s tab > ‘Task Allocation & Defect Allocation’ columns, specifically the second column, which corresponds to the ‘Defect Allocation’ column shows the ‘Not Allowed’ message

e.g screenshot below

Environment

Jira Align

Solution

Enable the ‘Defect Allocation’ toggle as per Jira Align - Sprint Capacity  

• Defect Allocation: The total number of hours allocated for defect remediation. To set defect allocations for team members in a sprint, the Enable Defect Allocation setting found at Administration > Platform > Team must be enabled

After enabling the toggle the Defect Allocation column is shown: