Who this is for: All users.
Overdue means a scheduled audit has passed its scheduled date without being started. It is not an error — the audit is intact and can be conducted at any time.
Three ways to clear it:
Conduct it. Open the audit’s ⋮ menu and select View Audit. When the audit starts, it moves to In Progress.
Reschedule it. ⋮ → Edit Audit, and set a new date.
Delete it if it is not going ahead. Only possible while it has never been started — and this returns the audit to your allowance.
Why an audit is Overdue the moment it is created: it was scheduled with a date in the past. The scheduling screens do not warn about past dates, so check the date before you save.