Codemagic IOS build failure | The relationship 'devices' is required but was not provided with this request

Question

POST https://api.appstoreconnect.apple.com/v1/profiles returned 409: Relationship is required but was not provided. - The relationship 'devices' is required but was not provided with this request.

Answer 1

To use development certificates and profiles (for mobile applications), it is required that you have at least one existing mobile device on the Apple Developer Portal registered.

Check if you have something on this list: https://developer.apple.com/account/resources/devices/list

If not, then adding a device should fix the issue.