Instagram Channel

Firstly, you need an Instagram business account. To change from personal account to business account, follow steps 1, 2 and 3 in the following screenshot and choose "Business":

Then connect your Instagram business account with your Facebook page. A Facebook page is a must, if you don't have one, create a new page.

Go to the "Settings" of your Facebook page, then "Instagram", "Connect Account".

The next step is to turn on the "Allow access to messages" in your Instagram app, see steps 1 to 5 in the following screenshot: Menu - Settings - Privacy - Messages - Allow access to messages

Finally, in Channel Automation, let's connect your Instagram with Channel Automation. Go "Facebook" and "Reconnect" (Yes, Facebook, not Instagram):

Continue as yourself or click "Edit Settings" if you've previously linked Channel Automation to your Facebook.

IMPORTANT - In the above screenshot, select ALL the Instagram Business Accounts that you wanted to use with Channel Automation, not just for the current workspace.

Give all permissions and after the connection, you are able to see your Instagram flow in both "Facebook" and "Instagram":

Talk to Instagram Bot

Instagram doesn't support Preview feature, so to talk to your Instagram bot:

Search your account name on Instagram or goto the Instagram section on Channel Automation dashboard, click on the URL link below the bot name to visit your Instagram page
follow the account and click Message to start the conversation.