Automation of message posting to Microsoft Teams Channel

A issue is we could not post message to MS teams channel with Automations.

Currently we are trying to use Automation of message posting to MS Teams. Currently we connected to teams API with company system admin account, and every user account could show teams Group, but Channel could not be shown in dropdown list to be selected.


Can you please advise the reason why channel list could not be shown, and how to show channel list with any further actions.

Thank you for your kind advice!!