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Integrating Google Cloud services →hardMultiple ChoiceObjective-mapped

Quick Answer

The answer is an OIDC audience mismatch, specifically that the OIDC token audience does not match the Cloud Run service's URL. This is the most likely issue because when a Pub/Sub push subscription is configured to authenticate to a Cloud Run service using an OIDC token, the audience claim in that token must exactly match the push endpoint URL of the service. If the audience is set to a generic URL like 'https://my-service.run.app/' but the actual Cloud Run service has a unique generated hash in its URL, the authentication handshake fails and messages are never delivered, even if IAM permissions are correct. On the Google Professional Cloud Developer exam, this scenario tests your understanding of how Pub/Sub push authentication works with serverless endpoints, and the common trap is assuming that IAM roles alone guarantee delivery. Remember: the audience is not just a formality—it must be an exact string match to the service’s URL, including the trailing slash. Memory tip: “Audience equals endpoint, or your messages will end.”

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.

Exhibit

{
  "name": "projects/my-project/subscriptions/my-sub",
  "topic": "projects/my-project/topics/my-topic",
  "pushConfig": {
    "pushEndpoint": "https://my-service.run.app/",
    "oidcToken": {
      "serviceAccountEmail": "my-sa@my-project.iam.gserviceaccount.com",
      "audience": "https://my-service.run.app/"
    }
  },
  "ackDeadlineSeconds": 10
}

Refer to the exhibit. A developer configured a Pub/Sub push subscription to a Cloud Run service. Messages are not being delivered to the Cloud Run service. The developer verified that the service is running and the IAM permissions are correct. What is the most likely issue?

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.

Question 1hardmultiple choice
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Exhibit

{
  "name": "projects/my-project/subscriptions/my-sub",
  "topic": "projects/my-project/topics/my-topic",
  "pushConfig": {
    "pushEndpoint": "https://my-service.run.app/",
    "oidcToken": {
      "serviceAccountEmail": "my-sa@my-project.iam.gserviceaccount.com",
      "audience": "https://my-service.run.app/"
    }
  },
  "ackDeadlineSeconds": 10
}

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 OIDC token audience does not match the Cloud Run service's URL

Option B is correct because the OIDC token audience must exactly match the URL of the Cloud Run service. In the exhibit, the audience is 'https://my-service.run.app/' which should be the same as the push endpoint, but if the Cloud Run service has a different URL (e.g., with a generated hash), the authentication will fail. Option A is possible but less likely because messages would still be delivered and then acknowledged if processing time is less than 10 seconds. Option C is incorrect because the endpoint is HTTPS. Option D is incorrect because the service account needs the token creator role, not publisher.

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 service account does not have the pubsub.publisher role

    Why it's wrong here

    The service account needs the roles/iam.serviceAccountTokenCreator role to generate OIDC tokens, not publisher.

  • ✓

    The OIDC token audience does not match the Cloud Run service's URL

    Why this is correct

    The audience must match the exact URL of the service for authentication to succeed.

    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 push endpoint URL is not a valid HTTPS endpoint

    Why it's wrong here

    The exhibit shows an HTTPS URL, so it is valid.

  • ✗

    The ackDeadlineSeconds is too short for the Cloud Run service to process messages

    Why it's wrong here

    Messages would still be delivered and retried; this would not prevent delivery entirely.

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

    The exhibit shows an HTTPS URL, so it is valid.

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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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 OIDC token audience does not match the Cloud Run service's URL — Option B is correct because the OIDC token audience must exactly match the URL of the Cloud Run service. In the exhibit, the audience is 'https://my-service.run.app/' which should be the same as the push endpoint, but if the Cloud Run service has a different URL (e.g., with a generated hash), the authentication will fail. Option A is possible but less likely because messages would still be delivered and then acknowledged if processing time is less than 10 seconds. Option C is incorrect because the endpoint is HTTPS. Option D is incorrect because the service account needs the token creator role, not publisher.

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.

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Last reviewed: Jun 24, 2026

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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.