hi Team , 

sorry if this case is overhead but I was trying to read a lot and found one more similar issue:

https://www.zabbix.com/forum/zabbix-troubleshooting-and-problems/21004-actions-event-acknowledged-ack?t=20763

according to link it was fixed in 3.4 

Objective:  Automatically open INC if Zabbix PROBLEM event is  acknowledged in WEB fronted problems widget by triggering  Action Step to send message to Marval media. 

Setup:

Marval media type is script that is located in \alertscripts and looking for ARGs

./trigger.sh {HOST.HOST},{HOST.IP}, {EVENT.AGE},{EVENT.ID},{ITEM.NAME},{ITEM.VALUE},{TRIGGER.NAME},{TRIGGER.SEVERITY},{TRIGGER.STATUS},{TRIGGER.VALUE}

The user and group is created with read rights to all host groups and has linked same Marval media type. 

Action is created for Operations 

If I remove Condition :  Event acknowledged equals Ack

all works well and it sends message via trigger.sh for every new PROBLEM event. 

If I add condition like in screenshot to initiate step 1 only on ACK Problem events it not trigger anything . 

The user that acknowledge Problem is in same group like Ack Recipient and there should be no issues with permissions. 

any feedback would be appreciated. and sorry if this is not defect but miss configuration.