Question 554 of 966

Prepare the data →mediumMultiple ChoiceObjective-mapped

Quick Answer

The answer is that the authority URL must point to the specific Azure AD tenant rather than the generic 'common' endpoint. When configuring OAuth2 authentication for Power BI connecting to Azure SQL Database, the 'common' endpoint is designed for multi-tenant applications and cannot resolve the tenant-specific authentication context required for scheduled refreshes. This mismatch causes the refresh to fail because Power BI cannot verify the user’s identity against a single, trusted directory. On the PL-300 exam, this scenario tests your understanding of Azure AD integration and the difference between single-tenant and multi-tenant endpoints. A common trap is assuming 'common' works universally, but for scheduled data refreshes, the tenant ID must be explicitly specified. Remember the memory tip: "Common is for apps, tenant is for maps"—meaning 'common' works for interactive app sign-ins, but a specific tenant maps directly to your organization’s directory for automated refreshes.

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.

Exhibit

Refer to the exhibit.

```json
{
  "name": "SalesDataConnector",
  "type": "SQL",
  "connectionString": "Server=tcp:myserver.database.windows.net,1433;Initial Catalog=SalesDB;Persist Security Info=False;Encrypt=True;TrustServerCertificate=False;",
  "authentication": {
    "method": "OAuth2",
    "clientId": "00000000-0000-0000-0000-000000000000",
    "authority": "https://login.microsoftonline.com/common",
    "resource": "https://database.windows.net/"
  }
}
```

You are reviewing a Power BI data source configuration for an Azure SQL Database. The connection uses OAuth2 authentication. However, when scheduling a refresh, the refresh fails with an error that authentication fails. 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.

Question 1mediummultiple choice

Full question →

Exhibit

Refer to the exhibit.

```json
{
  "name": "SalesDataConnector",
  "type": "SQL",
  "connectionString": "Server=tcp:myserver.database.windows.net,1433;Initial Catalog=SalesDB;Persist Security Info=False;Encrypt=True;TrustServerCertificate=False;",
  "authentication": {
    "method": "OAuth2",
    "clientId": "00000000-0000-0000-0000-000000000000",
    "authority": "https://login.microsoftonline.com/common",
    "resource": "https://database.windows.net/"
  }
}
```

A
The authority URL should point to the specific Azure AD tenant, not 'common'
Using 'common' can cause authentication failures; it should be the specific tenant ID.
B
The connection string has 'Encrypt=True' which is incompatible with OAuth2
Why wrong: Encrypt is recommended and compatible.
C
The server name in the connection string is incorrect
Why wrong: The server name appears valid.
D
The resource URL should be 'https://management.azure.com/'
Why wrong: The resource for SQL Database is 'https://database.windows.net/'.

Full breakdown with real-world context →

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 authority URL should point to the specific Azure AD tenant, not 'common'

When using OAuth2 authentication with Azure SQL Database in Power BI, the authority URL must point to the specific Azure AD tenant (e.g., 'https://login.microsoftonline.com/your-tenant-id') rather than the generic 'common' endpoint. The 'common' endpoint is designed for multi-tenant applications and cannot resolve the tenant-specific authentication context required for scheduled refreshes, leading to authentication failures.

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 authority URL should point to the specific Azure AD tenant, not 'common'
Why this is correct
Using 'common' can cause authentication failures; it should be the specific tenant ID.
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 connection string has 'Encrypt=True' which is incompatible with OAuth2
Why it's wrong here
Encrypt is recommended and compatible.
✗
The server name in the connection string is incorrect
Why it's wrong here
The server name appears valid.
✗
The resource URL should be 'https://management.azure.com/'
Why it's wrong here
The resource for SQL Database is 'https://database.windows.net/'.

Common exam traps

Common exam trap: answer the scenario, not the keyword

The trap here is that candidates often assume 'common' is always acceptable for OAuth2 flows, but Power BI scheduled refreshes require a tenant-specific authority URL to ensure the authentication context matches the Azure SQL Database's tenant.

Detailed technical explanation

How to think about this question

Under the hood, OAuth2 for Azure SQL Database requires the token to be issued for the specific resource 'https://database.windows.net/'. The 'common' authority endpoint redirects to the home tenant of the user, but for scheduled refreshes in Power BI, the service principal or user context must be explicitly tied to the tenant hosting the database. If the tenant is not specified, Azure AD cannot validate the token request, resulting in an 'AADSTS50020' error indicating a tenant mismatch.

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.

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FAQ

Questions learners often ask

What does this PL-300 question test?

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 authority URL should point to the specific Azure AD tenant, not 'common' — When using OAuth2 authentication with Azure SQL Database in Power BI, the authority URL must point to the specific Azure AD tenant (e.g., 'https://login.microsoftonline.com/your-tenant-id') rather than the generic 'common' endpoint. The 'common' endpoint is designed for multi-tenant applications and cannot resolve the tenant-specific authentication context required for scheduled refreshes, leading to authentication failures.

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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Last reviewed: Jun 24, 2026

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