Steps to reproduce:

1. Configure integration with MS teams as described in https://www.zabbix.com/cz/integrations/msteams
2. All alerts forwarded to MS Teams have their summary set to hard-coded "Zabbix" instead of the actual summary. That summary is used in notificaion popup banners on desktop and mobile msteams app and also in the MS Teams Activity feed. Because of this bug the displayed notifications don't provide any usefull information and user is forced to open details of the message to see any details.

before:

after:

See attached patch file...