# 🤔 Technical FAQ

## You see a 403 Error screen instead of the CMP

This is a CDN delivery problem, usually you can check 2 aspects:

1. You are using the correct **CMP SDK API-KEY**. Beware that it is different from the Proximity SDK api-key!
2. You can contact your Next14 account to check a **configuration problem** on your CMP instance

![](/files/KnDYVbJr0dxHVHuMlZUZ)

## Can I preview my CMP ?

From any browser you can use the following url to preview your CMP UI:

```
https://cmp.datafront.co/{{YOUR_CMP_API_KEY}}/cmp-m-2.html
```

## Will Google AdMob serve Ads if all consents are refused ?

According to [Google Documentation](https://support.google.com/admob/answer/10105530?hl=en\&ref_topic=10303737\&sjid=1360117544596577143-EU), Google will serve Limited Ads only based on legitimate interest or consent for purposes 2, 7, 9, and 10.


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