Take zabbix version >= 3.4 into account concerning "applications" rules:
No more "updateExisting". See this extract from zabbix 3.4 documentation
Parameter Type Description
applications object Rules on how to import applications.
Supported parameters:
createMissing - (boolean) if set to true, new applications will be created; default: false;
deleteMissing - (boolean) if set to true, applications not present in the imported data will be deleted from the database; default: false.
Take zabbix version >= 3.4 into account concerning "applications" rules: No more "updateExisting". See this extract from zabbix 3.4 documentation
Parameter Type Description applications object Rules on how to import applications.
Supported parameters: createMissing - (boolean) if set to true, new applications will be created; default: false; deleteMissing - (boolean) if set to true, applications not present in the imported data will be deleted from the database; default: false.