I configured the MatterMost Media and configured an action that use that media, but in the action log I always get this error.

Mattermost notification failed: [400] Paramètre post_id invalide ou manquant dans l'URL de la requête

I have also try to test the Mattermost Media Type and I always get this error

00:00:00.143 [Debug] [ Mattermost Webhook ] Mattermost notification failed: TypeError: undefined not callable (property 'format' of [object Object])

I also updated the Mattermost media template from the official GIT ( https://git.zabbix.com/projects/ZBX/repos/zabbix/browse/templates/media/mattermost ) to correct the type that was corrected on 20 Mai 2020 but still have the same problem.

This is a fresh install of Zabbix 5.0.1 on CentOS 8 with Postgress