Update; I received an email from microsoft regarding these failures, it had no additional information, just failed.
Solved; I just realized there is a more appropriate "MS Teams Workflow webhook" version, entered that and it works.
---------------------------original issue below----------------------
Using this guide; https://www.zabbix.com/integrations/msteams
I imported the yaml file from zabbix-release-7.0@0a2241552aa
My server is currently Zabbix 7.0.25 LTS
Originally I got error Teams failed; No media defined for user. - discovered the media didn't save somehow. Fixed that. Now I'm up against this blank error.
I verified my teams webhook URL works in OpenCanary. It is in the form of this below and was created with Workflow / Power Automate.

Logs on disk are also empty of reason;
Solved; I just realized there is a more appropriate "MS Teams Workflow webhook" version, entered that and it works.
---------------------------original issue below----------------------
Using this guide; https://www.zabbix.com/integrations/msteams
I imported the yaml file from zabbix-release-7.0@0a2241552aa
My server is currently Zabbix 7.0.25 LTS
Originally I got error Teams failed; No media defined for user. - discovered the media didn't save somehow. Fixed that. Now I'm up against this blank error.
I verified my teams webhook URL works in OpenCanary. It is in the form of this below and was created with Workflow / Power Automate.
Code:
https://defaulta5a5LotsOfRandomStuffaea.74.environment.api.powerplatform.com:443/powerautomate/automations/direct/workflows/f4244db8BigRandomThing6f66/triggers/manual/paths/invoke?api-version=1&sp=%2Ftriggers%2Fmanual%2Frun&sv=1.0&sig=A0-2FQKMoreRandomThingsam9muUc
Logs on disk are also empty of reason;
Code:
user@server-zbxv6:/var/log/zabbix$ sudo egrep Teams zabbix_server.log 1151:20260518:135418.740 [MS Teams Webhook] FAILED with response: 1151:20260518:135418.740 [MS Teams Webhook] notification failed: 1149:20260518:135428.687 [MS Teams Webhook] FAILED with response: 1149:20260518:135428.687 [MS Teams Webhook] notification failed: 1151:20260518:135438.739 [MS Teams Webhook] FAILED with response: 1151:20260518:135438.739 [MS Teams Webhook] notification failed: 1151:20260518:140019.350 [MS Teams Webhook] FAILED with response: 1151:20260518:140019.350 [MS Teams Webhook] notification failed: 1151:20260518:140030.386 [MS Teams Webhook] FAILED with response: 1151:20260518:140030.386 [MS Teams Webhook] notification failed: 1149:20260518:140041.505 [MS Teams Webhook] FAILED with response: 1149:20260518:140041.505 [MS Teams Webhook] notification failed: user@server-zbxv6:/var/log/zabbix$