PL-900 Practice Question: Demonstrate the capabilities of Power Automate
A sales team uses a Power Automate flow that creates a contact in Dynamics 365 Sales whenever a new lead is added to a Salesforce system. The flow has been running successfully for months, but recently it started failing with an authentication error. 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 Salesforce connection credentials have expired
Authentication errors typically occur when the connection credentials for the connected service (Salesforce) expire or are revoked. Option A is incorrect because exceeding execution quotas would cause flow failures but not specifically authentication errors. Option B is incorrect because schema changes would cause data conversion or mapping errors, not authentication errors. Option C is incorrect because API rate limits would produce throttling errors (e.g., HTTP 429), not authentication errors.
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 flow has exceeded its daily execution quota
Why it's wrong here
Quota exhaustion returns a throttling or 'flow run limit exceeded' error, not an authentication failure, so it cannot produce the symptom described. Daily execution quotas matter when a flow runs far more often than its plan allows, which is a licensing scenario rather than a credential one.
- ✗
The lead entity schema in Salesforce has changed
Why it's wrong here
A Salesforce schema change breaks field mappings and produces missing-property or invalid-type errors, not authentication failures. Schema drift is the right diagnosis when a previously working action suddenly reports unmapped or renamed columns after a Salesforce release, not when credentials are rejected.
- ✗
The flow is hitting API rate limits
Why it's wrong here
API rate limiting returns HTTP 429 throttling responses, not an authentication error, so it does not match the symptom. Rate limits are the correct diagnosis when a high-volume flow intermittently fails during peak periods while credentials remain valid.
- ✓
The Salesforce connection credentials have expired
Why this is correct
Expired Salesforce connection credentials break the stored OAuth token Power Automate uses to authenticate against Salesforce, so the trigger or action fails with an authentication error. Since the flow ran successfully for months before failing, token expiry—not configuration or licensing—is the likely cause.
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