title: Python boto3 and SQS not receiving messages
body: <p>I am trying to implement sending and receiving messages using Amazon's SQS in Python
  nothing i do makes the receiving end of my code retrieve my sent messages,
  what am i doing wrong?</p>
  <p>send.py:</p>
  <pre><code>SESSIONS_ACCESS_KEY = &quot;************&quot; 
  SESSIONS_SECRET_KEY = &quot;************&quot;
  sess = boto3.session.Session(aws_access_key_id=SESSIONS_ACCESS_KEY, aws_secret_access_key=SESSIONS_SECRET_KEY, region_name='eu-central-1')
  sqs = sess.resource(&quot;sqs&quot;)
  queue = sqs.get_queue_by_name(QueueName='myTestQueue.fifo')
  response = queue.send_message(
      MessageBody=&quot;TEST 123&quot;,
      MessageGroupId='messageGroup1'
  )
  
  print(response.get('MessageId'))
  print(response.get('MD5OfMessageBody'))
  </code></pre>
  <p>rec.py:</p>
  <pre><code>import time
  import boto3
     
  SESSIONS_ACCESS_KEY = &quot;************&quot; 
  SESSIONS_SECRET_KEY = &quot;************&quot;
  sess = boto3.session.Session(aws_access_key_id=SESSIONS_ACCESS_KEY, aws_secret_access_key=SESSIONS_SECRET_KEY, region_name='eu-central-1')
  sqs = sess.resource(&quot;sqs&quot;)
  
  queue = sqs.get_queue_by_name(QueueName='myTestQueue.fifo')
  
  # Process messages by printing out body
  while True:
      messages = queue.receive_messages()
      print('Amount of existing Queue messages',len(messages))
      for message in messages:
          print('msg:',message.body)
          message.delete()
      time.sleep(5)
  </code></pre>
  <p>When running the send.py python file i get the following:</p>
  <pre><code>1451fdb5-0f95-45d6-b1c1-76d9092fb49a
  911e12e2292eb0914f39540ae513721c
  </code></pre>
  <p>But the rec.py python file i keeps getting a 0 messages in queue notification:</p>
  <pre><code>Amount of existing Queue messages 0
  Amount of existing Queue messages 0
  Amount of existing Queue messages 0
  Amount of existing Queue messages 0
  </code></pre>
  <p>What am i doing wrong? should i set the MessageGroupId in the receiving end as well? should i use other commands for either sending or receiving the message?</p>