Hi @MJ_33
Can you try opening this URL in your Browser?
https://api.telegram.org/bot{bot_token}/sendMessage?chat_id={chat_id}&text=hello
Make sure to replace {bot_token}
with your actual bot token and {chat_id}
with your actual chat ID.
Please note that Chat ID of your Telegram Channel starts with a prefix of -100
something like this for example -1001367229836
If it’s working correctly then place the working chat ID in telegram node.