AI-103 Computer Vision Practice Question
You are testing a Custom Vision model via the REST API. You receive an HTTP 400 Bad Request error with the message 'InvalidProjectId'. 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 project ID GUID in the request URL is incorrect or does not exist in this Custom Vision account.
The project ID GUID provided in the URL path is malformed, does not exist, or belongs to a different region/resource.
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 image file format is invalid.
Why it's wrong here
Invalid image format returns a different bad request message regarding image decoding.
- ✓
The project ID GUID in the request URL is incorrect or does not exist in this Custom Vision account.
Why this is correct
An invalid project ID returns a 400 Bad Request indicating the project cannot be found.
- ✗
The subscription has reached its monthly quota limit.
Why it's wrong here
Quota limits return HTTP 429 Too Many Requests.
- ✗
The prediction key header was omitted.
Why it's wrong here
Omitting prediction or training keys typically returns HTTP 401 Unauthorized.
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-103 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-103 exam.