You have a subscription that is not receiving messages even though the topic has published messages. Which configuration issue could cause this?

medium📝 Debug Q7 of 15

GCP - Cloud Pub/Sub

AThe subscription's acknowledgement deadline is set too high

BThe subscription is not attached to the correct topic

CThe topic has no IAM permissions set

DThe subscription has message filtering enabled with no matching attributes

Step-by-Step Solution

Solution:

Step 1: Check subscription-topic linkage
If the subscription is not linked to the correct topic, it will not receive messages published to the intended topic.
Step 2: Evaluate other options
A high ack deadline does not prevent message delivery; lack of IAM on topic affects publishing, not subscription; filtering with no matches stops delivery but is less common.
Final Answer:
The subscription is not attached to the correct topic -> Option B
Quick Check:
Subscription-topic mismatch stops message flow [OK]

Quick Trick: Verify subscription is linked to the correct topic [OK]

Common Mistakes:

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