Ad Assistant Diagnosis best practices

Last updated: March 2026

This guide explains how to interpret Ad Assistant Diagnosis results and taking effective action. It outlines common usage moments and scenario-based guidance to help you review delivery or performance conditions and decide where to take next steps.

When to use

You may find Diagnosis especially useful in the following situations:

  • Daily monitoring: Incorporate diagnosis into daily checks to identify deviations early and maintain campaign consistency.

  • Performance volatility: Use diagnosis whenever you observe fluctuations in spend, CPA, conversion volume, or delivery behavior.

  • Scaling preparation: Before allocating additional budget, ensure no underlying issues exist that could impact efficiency.

How to interpret

When Diagnosis is triggered, you'll see a structured result that helps you understand what the system detected and where to review next. Each result typically includes:

  • Issue Category: The type of condition identified (e.g., delivery, spend, audience, creative, efficiency).

  • Insight Summary: A short explanation of what the system observed based on recent activity or performance patterns.

  • Suggested Actions: Potential next steps you may consider, depending on your setup.

  • Go-to Link: Direct access to the relevant setting in Ads Manager.

Diagnosis may surface different scenarios depending on what is happening in your ad group. The sections below explain what each scenario means when it appears, common reasons it may be triggered, and what you may want to review.

1. Hardblockers

Ad Assistant Diagnosis Scenario 1: Hard blocker

If Ad Assistant Diagnosis tells you: your ad group is not able to be delivered.

Common reasons:

  • The ad group or campaign is paused

  • Your account balance does not support delivery

  • Creatives are rejected or not eligible to be served

  • Recent edits may have temporarily stopped delivery

What you may want to review:

  • Whether the ad group or campaign is active

  • Whether additional balance is required

  • Creative eligibility or rejection reasons

  • Whether recent edits need time to take effect


2. Spending drop

If Ad Assistant Diagnosis tells you: your spend is noticeably lower than the previous day.

Common reasons:

  • Audience size decreased

  • Fewer creatives are actively delivering

  • Delivery windows or competition shifted

  • A recent configuration change affected serving

What you may want to review:

  • Audience size and availability

  • Creative-level delivery patterns

  • Schedule or delivery window settings

  • Short-term fluctuations after recent edits


3. Insufficient spending

Ad Assistant Diagnosis Scenario 3: Insufficient spend

If Ad Assistant Diagnosis tells you: your ad group is not using its budget as expected.

Common reasons may include:

  • Ad group competitiveness is limited (e.g. weak creatives or insufficient budget)

  • Account balance is lower than the ad group's daily budget

  • Budget settings restrict delivery (e.g. lifetime budget)

  • Delivery window does not align with livestream schedule

  • Inconsistent optimization goals across ad groups within a CBO campaign

  • Learning is unstable

What you may want to review:

  • Refresh creatives or gradually increase budget to improve competitiveness

  • Add balance to ensure sufficient funds relative to the daily budget

  • Consider switching from lifetime budget to daily budget

  • Check whether livestream hours align with the ad delivery schedule

  • Align optimization goals across ad groups within the same CBO campaign

  • Extend learning phase


4. High CPA

If Ad Assistant Diagnosis tells you: your CPA is higher than usual or has recently increased.

Common reasons:

  • Strong-performing creatives stopped delivering

  • Audience characteristics changed

  • Learning was reset due to recent edits

  • Competitiveness shifted

What you may want to review:

  • Any recent edits to targeting, bids, or creatives

  • Status of previously top-performing creatives

  • Changes in audience performance

  • Whether additional time is needed for stabilization


5. Top-Performing Ad Groups

If Ad Assistant tells you: this ad group is performing well and may be suitable for scaling.

Common reasons:

  • Stable delivery and CPA

  • Completed learning

  • Strong creative - audience fit

What you may want to review:

  • Increasing budgets gradually

  • Using duplication for controlled scaling

  • Keeping core settings stable to maintain performance