MI        This condition is triggered when the server denies your client's request to leave a channel, after you request to leave using the Channel > Leave action.

You can read the reason your leave request was denied with the Deny reason (for on […] denied) expression.

The channel you tried to leave is also auto-selected, so you can read its name and other details using the Selected channel expressions.

Normally, attempting to leave will cause the same denial with the same deny reason, so you should not program your client to attempt to leave again if denied.

The default server behavior will never deny you leaving a channel, only customized servers may do this – so you should only program for this condition if you are familiar with the server and know it may deny leave requests.