The error may have occurred because the creatives were assigned to the Android operating system instead of iOS.
- They assigned the creative to run across all mobile platform types.
- They assigned an HTML5 ad creative to run on desktop.
- They assigned the creative to run across multiple mobile carriers.
- They assigned the creative to the Android operating system.
The correct answer is: They assigned the creative to the Android operating system
Explanation: Campaign Manager 360 allows advertisers to target specific platforms, such as Android or iOS. If creatives are mistakenly assigned to a different operating system than intended, they will not serve correctly, leading to errors. Ensuring that creatives are configured for the correct platform is essential for proper ad delivery. support.google.com