Hey there Zrfhazhra,
Upon researching your question, we wanted to first make sure you had the steps needed to create that iCloud email address: Create a primary email address for iCloud Mail If those are the steps you're taking, we'd like to learn more about what's happening, along with ruling out some possible causes:
- You mentioned there's an issue when you try creating one, but what exactly occurs? The more details you provide us, the better we'll understand the issue.
- Have you already created an iCloud email address for the Apple ID you're currently using?
- Sometimes unexpected behavior can be resolved with a restart: Restart your iPhone and/or Restart your iPad
- If you have a compatible iPhone/iPad model, the latest version is iOS 16.4/iPadOS 16.4. You can verify this within Settings > General > About. In case you needed it, this link shows how to first back up, then Update your iPhone or iPad.
Cheers!