title: Can't send message to some bot users in Telegram
body: <p>I made the bot in telegram which accepts some requests from users. My bot should send notifications about changes of the request status. I do it separate from my script by sending get request. But some users can not get the notification message, because this error <strong>"{
      "ok": false,
      "error_code": 403,
      "description": "Forbidden: bot was blocked by the user"
  }"</strong> The user didn't block the bot. The bot blocked itself for some reason. I can't understand how it happens. What is the reason of blocking bot by the user unconsciously? I want write the guid for user "how do not block bot", but I don't know the reason. How I can solve this issue?</p>
  
  <p>Here's my request:</p>
  
  <pre><code>https://api.telegram.org/bot&lt;bot_token&gt;/sendMessage?chat_id=&lt;chat_id&gt;&amp;text=&lt;Your request status changed&gt;&amp;reply_markup={"inline_keyboard": [[{"text": "View", "callback_data": "&lt;request_id&gt;"}]]}
  </code></pre>