Chat #58

**Source:** [Setting up Ad Units](https://tripledotstudios.atlassian.net/wiki/spaces/KB/pages/4304109569/Setting+up+Ad+Units) ## Troubleshooting Formula CPM Ad Serving Issues When ads are not serving after enabling formula-based CPM, consider the following troubleshooting steps: ### 1. Verify Formula Parameters 1. **Minimum Ad Requests** - Ensure you have set the correct minimum number of ad requests to apply the formula - Default: Empty - Range: 1-50 requests - Must be less than "Ad requests to apply formula to" value 2. **Successful Ad Requests** - Check the "Use successful ad requests only" setting - If enabled, only successful ad requests are used for calculation - Verify you have enough successful ad requests to meet the minimum threshold ### 2. Check Formula Configuration - **Formula Type**: - Verify selection (Median or Average) - Default: Median - **Percentage Coefficient**: - Confirm multiplier is between 0 and 2 - Recommended: Start with 1.0 for initial testing ### 3. Fallback Mechanisms  #### Insufficient Data Handling Configure "If insufficient ad requests" setting: - **Return fallback value**: Uses static CPM value - **Return nothing**: No CPM floor sent #### Failed Requests Handling - Enable "Use static in case of failed requests" - Set "Number of failed requests" (1-50) - Allows fallback to static value after X consecutive failed requests ### 4. Verification Steps 1. Confirm minimum ad request requirements are met 2. Check static fallback CPM is configured 3. Review percentile configurations 4. Validate formula parameters 5. Monitor ad serving logs ### 5. Common Issues - Insufficient historical data - Misconfigured request limits - Overly restrictive formula parameters - Miscalculated percentage coefficient ### Recommended Action 1. Start with static CPM 2. Gradually introduce formula-based calculation 3. Monitor ad fill rates 4. Adjust parameters incrementally **Pro Tip**: Always maintain a valid fallback CPM to ensure ad serving continues during formula calculation challenges.