- A
The IAM policy binding granting the Cloud Tasks service account the Cloud Run Invoker role was removed during the deployment.
If the deployment pipeline modifies IAM policies, the binding for the Cloud Tasks service account may have been removed, causing 403 errors.
- B
The new revision has a bug causing a permission denied error when processing tasks.
Why wrong: A bug would result in 500 or 503 errors, not 403, and logs show requests reaching the service.
- C
The Cloud Tasks queue needs to be configured with an OIDC token and audience for the new revision.
Why wrong: OIDC configuration is on the queue and does not need to change per revision; it remains valid for the service URL.
- D
The Cloud Tasks queue's HTTP target URL needs to be updated to point to the new revision's specific URL.
Why wrong: The Cloud Run service URL remains the same across revisions, so the queue target does not need updating.
Quick Answer
The answer is that the IAM policy binding granting the Cloud Tasks service account the Cloud Run Invoker role was removed during deployment. This is correct because when a Cloud Run service requires authentication, the invoker—in this case, the `cloud-tasks-system` service account—must have the `roles/run.invoker` role on the specific service. The 403 status indicates the request reached the service but was denied at the IAM level, not the application layer. On the Google Professional Cloud Developer exam, this scenario tests your understanding of how Cloud Deploy and Cloud Build can overwrite existing IAM bindings if the deployment pipeline includes a `gcloud run deploy` command without explicitly preserving the invoker role. A common trap is assuming the error is caused by a misconfigured OIDC token or a broken queue URL, but those would produce different errors. Memory tip: think of the Cloud Tasks service account as a guest needing a key (the invoker role) to enter the Cloud Run door—if the deployment process changes the locks, the guest gets a 403.
PCD Integrating Google Cloud services Practice Question
This PCD practice question tests your understanding of integrating google cloud services. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A company runs a microservices application on Cloud Run. One service, `order-processor`, is invoked asynchronously via a Cloud Tasks queue. The Cloud Tasks queue is configured with an HTTP target pointing to the `order-processor` service URL. The service requires authentication (no unauthenticated invocations). The service account used by Cloud Tasks to invoke the service is `cloud-tasks-system@project.iam.gserviceaccount.com`. After deploying a new revision of `order-processor` using Cloud Build and Cloud Deploy, the team notices that tasks are failing with a 403 status. The Cloud Run service logs show the requests are reaching the service but returning 403. The previous revision worked fine. What is the most likely cause?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"most likely"Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
The IAM policy binding granting the Cloud Tasks service account the Cloud Run Invoker role was removed during the deployment.
Option B is correct. When Cloud Run requires authentication, the invoker's service account must be granted the roles/run.invoker role on the Cloud Run service. Although the IAM policy is set on the service, deploying a new revision with Cloud Build and Cloud Deploy may use a different service account or the IAM bindings might be overwritten if the deployment pipeline includes IAM policy updates. In this scenario, the IAM binding for the Cloud Tasks service account was likely removed or not applied to the new revision, causing the 403 error. Option A is incorrect because the Cloud Tasks queue configuration does not change with revisions; the URL remains the same. Option C is incorrect because the OIDC token is configured on the queue and is independent of the revision. Option D is incorrect because a permission denied error inside the service would result in a 500 or 503, not 403, and the logs show requests are reaching the service.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
The IAM policy binding granting the Cloud Tasks service account the Cloud Run Invoker role was removed during the deployment.
Why this is correct
If the deployment pipeline modifies IAM policies, the binding for the Cloud Tasks service account may have been removed, causing 403 errors.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
The new revision has a bug causing a permission denied error when processing tasks.
Why it's wrong here
A bug would result in 500 or 503 errors, not 403, and logs show requests reaching the service.
- ✗
The Cloud Tasks queue needs to be configured with an OIDC token and audience for the new revision.
Why it's wrong here
OIDC configuration is on the queue and does not need to change per revision; it remains valid for the service URL.
- ✗
The Cloud Tasks queue's HTTP target URL needs to be updated to point to the new revision's specific URL.
Why it's wrong here
The Cloud Run service URL remains the same across revisions, so the queue target does not need updating.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Trap categories for this question
Command / output trap
A bug would result in 500 or 503 errors, not 403, and logs show requests reaching the service.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
- Use explanations to understand the rule behind the answer.
TExam Day Tips
- Underline the problem statement mentally.
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.
What to study next
Got this wrong? Here's your next step.
Identify which PCD exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
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Integrating Google Cloud services — study guide chapter
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FAQ
Questions learners often ask
What does this PCD question test?
Integrating Google Cloud services — This question tests Integrating Google Cloud services — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The IAM policy binding granting the Cloud Tasks service account the Cloud Run Invoker role was removed during the deployment. — Option B is correct. When Cloud Run requires authentication, the invoker's service account must be granted the roles/run.invoker role on the Cloud Run service. Although the IAM policy is set on the service, deploying a new revision with Cloud Build and Cloud Deploy may use a different service account or the IAM bindings might be overwritten if the deployment pipeline includes IAM policy updates. In this scenario, the IAM binding for the Cloud Tasks service account was likely removed or not applied to the new revision, causing the 403 error. Option A is incorrect because the Cloud Tasks queue configuration does not change with revisions; the URL remains the same. Option C is incorrect because the OIDC token is configured on the queue and is independent of the revision. Option D is incorrect because a permission denied error inside the service would result in a 500 or 503, not 403, and the logs show requests are reaching the service.
What should I do if I get this PCD question wrong?
Identify which PCD exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
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Last reviewed: Jun 24, 2026
This PCD practice question is part of Courseiva's free Google Cloud certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the PCD exam.
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