No E-Mail when updating a Ticket

Hi, i have an issue on a new installation. When updating a ticket, no mail to the client will be sent. At the settings, there is no option for “ticket-updated”, as seen in the feature:

Is there any configuration missing or do you have any hint for me?
Version is 1.1.10, we are using the docker image.

Thanks alot!
Martin

PS: SMTP is working