@Volodymyr Litovka Thanks for reaching out. Can you please confirm which action you are using to post the message to the team's channel?
You can leverage the Post message in a chat or channel action and select the Group Chat from dropdown which will be heading of different group chat and post the message as below:
In case if you want to set the Group chat field property dynamically then you can leverage the List chats action based on your input if you don't have the channel ID.