AI-200 Event Driven Integration Practice Question
An event subscriber endpoint hosted on an Azure App Service web app is failing to receive events from an Azure Event Grid system topic. Upon investigation, you discover Event Grid received a handshake validation failure. What is the most likely cause?
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 web app did not correctly handle and echo back the validation code during the Webhook handshake.
When creating an Event Grid subscription, Event Grid sends a Subscription Validation event with a validation code. The endpoint must respond with the validation code to prove ownership before events are delivered.
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 event payload exceeded the 1 megabyte size limit.
Why it's wrong here
Size limit issues result in delivery failures, not handshake validation failures.
- ✗
The Service Bus connection string was incorrectly formatted.
Why it's wrong here
Event Grid webhooks do not use Service Bus connection strings.
- ✓
The web app did not correctly handle and echo back the validation code during the Webhook handshake.
Why this is correct
Webhook endpoints must respond to the validation OPTIONS/POST request by returning the validation response handshake.
- ✗
The App Service pricing tier does not support HTTPS connections.
Why it's wrong here
All standard App Service tiers support HTTPS, and Event Grid requires valid SSL certificates.
About these practice questions
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JA
Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed August 2026 · checked against the official Microsoft exam blueprint
This AI-200 practice question is part of Courseiva's free Microsoft 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 AI-200 exam.