# Build Error: You have already reached the maximum allowed number of keys for this service

Although not common, you may have an iOS build fail if you have an existing notification key which we are unable to use during the build process.

#### Cause:

You have an existing Notification Key in your Apple Developer Account. Adalo requires one key for push notifications within iOS apps which cannot be opted out of. 

#### Resolution:

Remove any Notification Key in order for Adalo to be able to create one so that we are able to upload this app to TestFlight. To do this, please follow these steps:

1. Log in to your [Apple Developer Account](https://developer.apple.com/account/resources/authkeys/list).
2. Navigate to "Account"
3. Select "Certificates", then Identifiers and Profiles, then go to the left side and select keys.
4. Then revoke access on a key using Apple Push Notifications service (APNs).
5. Go back to Adalo and create a new build for your iOS app. This will generate a fresh key and you should be able to proceed.


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