UnAck alert don't removes the ack in icinga2



if I unack an icinga2 alert in opsgenie the acknowledment in icinga2 don’t get removed.
In the script.log I can only see this line

19/02/12 19:26:31.300 WARN: Alert with id [c1fcc89d-4889-45d5-ae80-80f770b572d9-1549807121081] is unacknowledged by [xxxx] via [name:, type:web]

How can I enable the unack in icinga2/marid?

Best regards