Once an API key is revoked, any application or service that uses that key will lose access to your email marketing account. This means:
1. Immediate Loss of Access: The revoked key will no longer authenticate, and any dependent services will be unable to interact with your email marketing platform. 2. Error Messages: Applications and services attempting to use the revoked key will likely receive error messages indicating unauthorized access. 3. Need for a New Key: To restore functionality, you will need to generate and distribute a new API key to the relevant applications or services.