Here the error I see in my log
Logger: homeassistant.components.telegram_bot
Source: components/telegram_bot/__init__.py:585
Integration: Telegram bot (documentation, issues)
First occurred: January 18, 2022, 8:10:12 AM (1 occurrences)
Last logged: January 18, 2022, 8:10:12 AM
Error sending message: urllib3 HTTPError HTTPSConnectionPool(host='api.telegram.org', port=443): Max retries exceeded with url: /bot2137999371:AAEAAh_9C9seUj03r5QfBXDfMu9tnk7pTQo/sendMessage (Caused by NewConnectionError('<telegram.vendor.ptb_urllib3.urllib3.connection.VerifiedHTTPSConnection object at 0x7f8f1ec2b0>: Failed to establish a new connection: [Errno -3] Try again')). Args: (2131969101, 'hi'), kwargs: {'parse_mode': 'Markdown', 'disable_web_page_preview': None, 'disable_notification': False, 'reply_to_message_id': None, 'reply_markup': None, 'timeout': None}