

☝️ You'll also never run into this issue through the Slack UI/UX because you're not even able to access the channels UNTIL you are invited or join it.Ĭlick to see png example of a slack message stating my bot being added to a channel

Think of it this way: if you're using Slack on the web-browser or web-app, you wouldn't be able to post a message on a channel you haven't either joined or was invited to. I'm getting started with the Slack API as well, and I've come to realize that not_in_channel simply means that the user/bot you are using the token for hasn't joined that particular channel you're trying to perform an action on.
