Steps to reproduce:

1. Add Zabbix Connector to Teams Channel
2. Get URL from Connector and test with Zabbix media type / Curl / PowerShell

Result:
Error message: Connector configuration not found

I tested with the PS example from Microsoft:
https://docs.microsoft.com/en-us/microsoftteams/platform/webhooks-and-connectors/how-to/connectors-using

Expected:
The CURL and/or the PS Invoke-RestMethod Test should provide a 1 as result. **

Also see the following Forums post where other report the same problem:

https://www.zabbix.com/forum/zabbix-troubleshooting-and-problems/412357-zabbix-5-0-problem-with-ms-teams-webhook