Channel mentions via MSteams Incoming Webhook connectors - microsoft-teams

I am trying to use Channel mentions via MSteams Incoming Webhook connectors but it is not working for me. I am able to mention users but doing the same for Channel does not work. It simply gives me plain text.
I am following this link for JSON payload - https://powerusers.microsoft.com/t5/Building-Flows/Channel-Teams-mention-in-Adaptive-Cards/td-p/564320
Is this feature available for MSteams Incoming Webhook connectors ?

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Can a slack bot join automatically a channel?

I am building a slack application.
I added "incoming-webhook" to oauth scopes that let me choose the channel I want the App to post messages. However unless I ping the app in the channel to add it. I get a "channel not found" error.
Is it possible to add the app to a channel when installing app via oauth ? Without adding it manually by #app-name or /invite app-name ?
When you add an incoming-webhookscope to your app, the option to add a channel during authentication is specific to incoming webhooks not bot messages. So any messages you send via the incoming webhook will send to the channel you selected during authentication. Messages sent via [chat.postMessage][1] will require your bot to be a member of the destination channel, via invite. Incoming webhooks can only be linked to a single channel. You will have to create a new webhook for every channel you want to post to using webhooks. For that reason, I'd recommend using chat.postMessage instead. If you request the chat:write.public scope your bot will be able to post into any public channel without invitation.

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I've created an incoming Teams Webhook connector within a Teams group (using the method below).
I can successfully curl to the webhook internally and get the message to display ok.
MS have checked my tenant and access is as expected.
When I apply my URL for the webhook to any external service they eventually come back stating there was a problem detected with the webhook (Please make sure that your webhook endpoint of xxx is responding with a 2xx response code within 30 seconds of initial connection.)
Can anyone advise what else may need to be done?
Thanks
In Microsoft Teams, choose More options (⋯) next to the channel name and then choose Connectors.
Scroll through the list of Connectors to Incoming Webhook, and choose Add.
Enter a name for the webhook, upload an image to associate with data from the webhook, and choose Create.
Copy the webhook to the clipboard and save it. You'll need the webhook URL for sending information to Microsoft Teams.
Choose Done.
Incoming webhooks are special type of Connector in Teams that provide a simple way for an external app to share content in team channels and are often used as tracking and notification tools. Teams provides a unique URL to which you send a JSON payload with the message that you want to POST, typically in a card format. Cards are user-interface (UI) containers that contain content and actions related to a single topic and are a way to present message data in a consistent way. Please test the incoming webhook url using postman and let us know the payload result or status code. Would be help full for us to understand more.

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https://kik.botframework.com/api/V3...
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