PL-900 Practice Question: Describe the business value of Microsoft Power Platform
Exhibit
Refer to the exhibit.
```yaml
# Example: Power Apps component library reference
App.OnStart = Set(
varUserEmail,
User().Email
);
Set(varUserRole, LookUp(Roles, UserEmail = varUserEmail).Role)
```In a Power Apps canvas app, the App.OnStart property contains the code above. The LookUp function returns blank for a user who exists in the Roles data source. What is the most likely cause?
⚠ Common exam trap
A common mix-up: candidates assume the LookUp function will automatically match any column containing the user's email, ignoring the exact column name requirement, or they confuse this with a data refresh or function availability issue.
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 Roles data source column name does not match 'UserEmail'.
The LookUp function in Power Apps relies on exact column name matching. If the Roles data source has a column named 'Email' or 'UserID' instead of 'UserEmail', the function will not find a match and will return blank, even if the user exists. This is a common schema mismatch issue in canvas apps.
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 app needs to refresh the Roles data source first.
Why it's wrong here
Data source is typically loaded automatically, but refresh may help, but not the most likely cause.
- ✗
The Set function cannot store records.
Why it's wrong here
Set can store any value, including text from LookUp.
- ✗
The User() function is not available in Power Apps.
Why it's wrong here
User() is a valid function that returns current user info.
- ✓
The Roles data source column name does not match 'UserEmail'.
Why this is correct
Column name mismatch causes LookUp to return blank.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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