Thanks a lot Nguyen Van Tuan,Now, it works with private channels. Before, my bot was working only in public channels.
When i have tested with this Library of Andrey
Voytenkoon MT5, It not work well so i have some more simple step. Any people hit same error can try to change like me:
1. Confirm add https://api.telegram.org to Allow WebRequest for listed URL
2. When you using chat_id (like "-1001301234105") instead @channel_name, you will hit some error with
this code so i have change it
And now I confirm after i have do two things above, this library work well in MT5.
Thanks Andrey Voytenko again.
Right!!! Same problem!!!!