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You configured an SNS topic with two SQS queues subscribed, but only one queue receives messages. What is the most likely cause?

medium📝 Debug Q14 of 15
AWS - SNS and SQS
You configured an SNS topic with two SQS queues subscribed, but only one queue receives messages. What is the most likely cause?
ASNS only sends messages to one queue by design
BThe second queue's subscription is not confirmed
CThe message size exceeds SNS limits
DThe first queue deleted the message too fast
Step-by-Step Solution
Solution:

  1. Step 1: Check subscription confirmation

    SQS subscriptions to SNS require confirmation to activate delivery.

  2. Step 2: Understand SNS delivery behavior

    Without confirmation, SNS does not send messages to that queue.

  3. Final Answer:

    The second queue's subscription is not confirmed -> Option B

  4. Quick Check:

    Unconfirmed subscription blocks message delivery [OK]
Quick Trick: Confirm all subscriptions to receive messages [OK]
Common Mistakes:
  • Assuming SNS sends to only one queue
  • Blaming message size without checking subscription
  • Thinking message deletion affects delivery

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