Either 'Entitled Days' are not added under the profile by management or the number set by the management next to 'Max number of staff that can be booked off at once' has exceeded.

Ask your management to either add days under leave types or re-define the settings for limiting staff to book leaves at once.

For more information about adding the number of days under leave type or changing the setting for limiting staff to book leaves at once, go to 'Enable Leave Type and Assign Entitled Leave Days' or  'Limit Staff for Booking Leaves At Once' respectively.

If you have any further queries, please don't hesitate to reach out to us at support@humanity.com.