Issue Summary

Currently, it's only possible to send messages to public channels through Send Microsoft Teams message action component.

Steps to Reproduce

1. Create an Automation rule with Send Microsoft Teams message action component
2. Please sure to follow steps mentioned in Automation doc: https://support.atlassian.com/cloud-automation/docs/use-automation-with-microsoft-teams/
3. The above will work for public channels, but will fail for shared teams

Although no error message is shown in audit log, the message is not sent. In MS teams side, audit log reports that webhook failed.

Expected Results

Message should be sent.

Actual Results

Message is not sent if channel is set as shared or private.

Workaround

By creating a custom workflow in MS Teams side (instead of using a MS Teams template), it's possible to bypass this blocker:

https://confluence.atlassian.com/jirakb/posting-messages-in-ms-team-private-channels-1455882765.html