The answer is that the data source credentials are not provided in the gateway. Even when the gateway service is installed and running, it acts as a bridge between Power BI and your on-premises or cloud data sources, but it cannot authenticate to SharePoint Online to retrieve the Excel files without valid, stored credentials configured specifically for that data source. This is a common point of failure in Power BI data refresh failures from SharePoint Online, because the gateway requires explicit permission to access the file, separate from the dataset’s own settings. On the PL-300 exam, this scenario tests your understanding of gateway configuration versus gateway installation—a frequent trap where candidates assume a running gateway means all connections are ready. Remember, the gateway is like a locked door; installing it gives you the door, but you still need the key (credentials) to open it. Memory tip: “Gateway up ≠ data flowing—credentials are the key.”
PL-300 Prepare the data Practice Question
This PL-300 practice question tests your understanding of prepare the data. 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.
You have a Power BI dataset that uses data from Microsoft Excel files stored in SharePoint Online. Users report that the data is not refreshing as scheduled. You verify that the gateway is installed and running. What is the most likely cause of the refresh failure?
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 the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The data source credentials are not provided in the gateway.
Option D is correct because even when the gateway is installed and running, it must have valid data source credentials configured for the SharePoint Online Excel files. Without these credentials, the gateway cannot authenticate to SharePoint Online to retrieve the data, causing the scheduled refresh to fail. The gateway uses the stored credentials to connect to the data source during each refresh cycle.
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 gateway is not running.
Why it's wrong here
It is running.
✗
The gateway does not support SharePoint Online data sources.
Why it's wrong here
The gateway does support SharePoint Online; this is incorrect.
✗
The gateway is not configured to use the on-premises data source type.
Why it's wrong here
SharePoint Online is not on-premises.
✓
The data source credentials are not provided in the gateway.
Why this is correct
Even though the gateway is running, the credentials for the SharePoint Online data source must be configured in the gateway settings.
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 assume a running gateway automatically handles all data sources, but the gateway requires explicit credential configuration for each data source, including cloud-based ones like SharePoint Online.
Detailed technical explanation
How to think about this question
The on-premises data gateway uses a cloud service to bridge between Power BI and data sources, but for cloud sources like SharePoint Online, the gateway still requires explicit credentials to authenticate via OAuth or basic authentication. A common subtlety is that the gateway's 'Data Source Settings' in the Power BI service must have the credentials saved and tested; if the credentials expire or are incorrect, the refresh fails silently without indicating a gateway connectivity issue. In real-world scenarios, users often overlook that SharePoint Online credentials must be updated in the gateway settings after password changes or MFA policy updates.
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 cloud solutions architect for a retail company is evaluating services for a new workload. The correct answer here reflects best practice for the specific scenario described — not a general cloud recommendation. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.
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.
Prepare the data — This question tests Prepare the data — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The data source credentials are not provided in the gateway. — Option D is correct because even when the gateway is installed and running, it must have valid data source credentials configured for the SharePoint Online Excel files. Without these credentials, the gateway cannot authenticate to SharePoint Online to retrieve the data, causing the scheduled refresh to fail. The gateway uses the stored credentials to connect to the data source during each refresh cycle.
What should I do if I get this PL-300 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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Question Discussion
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