How can I get my iCloud email on my new iPhone?

Hello SimonQat,

Thanks for posting in the Apple Support Communities.

Are you following the actions from article, Set up iCloud Mail on all your devices - Apple Support to enable your email account on your device?

"Set up iCloud Mail on your iPhone, iPad, or iPod touch

Set up iCloud Mail on your iPhone, iPad, or iPod touch

• On your iPhone, iPad, or iPod touch, go to Settings > [your name] > iCloud
• If you want to send and receive iCloud Mail on your device, do one of the following:
  • iOS 16, iPadOS 16, or later: Tap Mail, then turn on Use on this [device].
  • iOS 15, iPadOS 15, or earlier: Turn on iCloud Mail (or Mail)

• If you want to keep Mail settings up to date across your devices, turn on iCloud Drive. The following settings stay up to date:
  • The order of your mailboxes (for all iOS and iPadOS devices)
  • Email address suggestions (for all iOS, iPadOS, and macOS devices)
  • VIPs (for all iOS, iPadOS, and macOS devices)

• To view your iCloud Mail, open the Mail app. Tap a mailbox or folder in the iCloud section.

For more information on how to use Mail on your iPhone, iPad, or iPod touch, see any of the following:

• iPhone User Guide: Send email in Mail on iPhone and Organize email in mailboxes on iPhone
• iPad User Guide: Send email in Mail on iPad and Organize email in mailboxes on iPad
• iPod touch User Guide (iOS 15 or earlier): Send email in Mail on iPod touch and Organize email in mailboxes on iPod touch"

When you set up your new iPhone, did you restore it using a backup from your previous device? If not, please know that this option will move all your data and settings over to the new iPhone, to make the transition simple.

Restore your iPhone, iPad, or iPod touch from a backup - Apple Support

Best regards.