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There could be several reasons for this issue. Here are some troubleshooting steps that you can follow:

Check the API token: Make sure that you have entered the correct API token while initializing the bot. You can obtain the API token from the BotFather bot on Telegram.
Check the internet connection: Ensure that your internet connection is stable and working correctly. You can check this by opening any website on your web browser.
Check the credentials: Verify that you have specified the correct credentials for the bot, such as the chat ID or bot username.
Check the Python version: Confirm that you are using the latest version of Python, as some libraries used in the bot may not be compatible with older versions of Python.
Check the logging: Add logging functionality to the bot code to see if there are any error messages that are preventing the bot from initiating.

If none of the above steps work, you can also try running the bot on a different device or contacting the support team for further assistance.