Mattermost notification failed: Field "zabbix_url" must contain a schema

[TelosOne]

The subject is the error.

We have set up the Mattermost web-hook, and the Macro according to THIS set of directions but when we test from Zabbix tMedia types this is the error we get:

:Mattermost notification failed: Field "zabbix_url" must contain a schema"

On searching the forum (and Google) there is only one post with reference and its unanswered.

[artodeto]

I am having the same Problem. My test is working only if I put in the value of the {$ZABBIX.URL} by hand in the test. Especially this [0] post helped me to make the test, at least, work.

[0]

https://www.zabbix.com/forum/zabbix-troubleshooting-and-problems/393447-mattermost-notification-failed-404-sorry-we-could-not-find-the-page?p=398467#post398467