This AI-102 practice question tests your understanding of implement natural language processing solutions. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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
{
"error": {
"code": "403",
"message": "Access denied due to invalid subscription key. Make sure to provide a valid key for an active subscription.",
"innererror": {
"code": "InvalidSubscriptionKey",
"message": "The provided subscription key is not valid for the Cognitive Services resource."
}
}
}
Refer to the exhibit. You receive this error when calling an Azure Cognitive Services API. 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.
Exhibit
{
"error": {
"code": "403",
"message": "Access denied due to invalid subscription key. Make sure to provide a valid key for an active subscription.",
"innererror": {
"code": "InvalidSubscriptionKey",
"message": "The provided subscription key is not valid for the Cognitive Services resource."
}
}
}
A
The API endpoint is incorrect.
Why wrong: The error is about the key, not the endpoint.
B
The subscription key has expired.
Why wrong: The error says invalid, not expired.
C
The subscription key is from a different region.
Why wrong: Keys are not region-specific; they are tied to the resource.
D
The subscription key is not valid for this Cognitive Services resource.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The subscription key is not valid for this Cognitive Services resource.
The error indicates that the subscription key provided is not associated with the Cognitive Services resource being accessed. In Azure Cognitive Services, each resource has a unique set of keys, and using a key from a different resource (even in the same region) will result in a 401 Unauthorized error with this specific message. Option D is correct because the key must match the resource's endpoint exactly.
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 API endpoint is incorrect.
Why it's wrong here
The error is about the key, not the endpoint.
✗
The subscription key has expired.
Why it's wrong here
The error says invalid, not expired.
✗
The subscription key is from a different region.
Why it's wrong here
Keys are not region-specific; they are tied to the resource.
✓
The subscription key is not valid for this Cognitive Services resource.
Why this is correct
Inner error explicitly states that.
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.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse region mismatch with key validity, but Azure Cognitive Services keys are not region-bound—they are resource-bound, so the error is about the key not matching the resource, not the region.
Detailed technical explanation
How to think about this question
Azure Cognitive Services uses two authentication mechanisms: subscription keys and Azure Active Directory tokens. When using key-based authentication, the API validates the key against the resource's key vault in the backend. The error 'The subscription key is not valid for this Cognitive Services resource' specifically occurs when the key belongs to a different Cognitive Services account, even if it is in the same subscription or region. This is a common issue when developers accidentally copy keys from a different resource in the Azure portal.
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.
TExam Day Tips
→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 exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Implement natural language processing solutions — This question tests Implement natural language processing solutions — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The subscription key is not valid for this Cognitive Services resource. — The error indicates that the subscription key provided is not associated with the Cognitive Services resource being accessed. In Azure Cognitive Services, each resource has a unique set of keys, and using a key from a different resource (even in the same region) will result in a 401 Unauthorized error with this specific message. Option D is correct because the key must match the resource's endpoint exactly.
What should I do if I get this AI-102 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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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