It’s fairly easy to send a message to a Telegram Channel using curl. Copy and paste the following command in, replacing the API_TOKEN, chat_id, and test_message, with the appropriate items.

curl -s -o /dev/null -X POST -H "Content-Type: application/json" -d "{\"chat_id\": \"-100XXXXXXXXXX\", \"text\": \"test_message\", \"disable_notification\": true}" https://api.telegram.org/bot{API_TOKEN}/sendMessage

https://stackoverflow.com/questions/68213124/telegram-example-of-how-to-use-curl-for-windows-10-to-message-myself-with-a-bot

Need to send a message to Teams? Check out the following post.

Bash script to send messages to Microsoft Teams