An “Access Denied: Overridden” occurs when there is a higher priority taking precedence over your card or pin.
There are two conditions that would cause this event to occur: Force Off or Lock Down. Both conditions can be created manually or through the use of a Function Group.
To discover if this is caused by Force Off or Lock Down:
The screenshot shows ‘OFF’ meaning Forced Off, and ‘DWN’ meaning Locked Down