How to verify my Apple ID on iCloud

👉 Sign in to your Apple ID account page and edit / update your Apple ID details -> https://appleid.apple.com

See also -> Two-factor authentication for Apple ID

Two-factor authentication for Apple ID - Apple Support

• Two-factor authentication is designed to make sure that you're the only person who can access your account.

BTW:

You are sign in here .  .  .  with your Apple ID & Password.

Your Apple ID is the personal account you use with all Apple products and services. It includes the email address and password you use to sign in, as well as the contact, payment, and security details that you use with Apple.

You can’t merge multiple Apple ID accounts.

What happens when you use the same Apple ID & Password that you use to sign in here?

See -> Sign in with your Apple ID -> Sign in with your Apple ID - Apple Support

Log out of iCloud and back in again.

Read this document to learn how to sign out of iCloud on your iPhone, iPad, iPod touch, Apple TV, or Mac --> Sign out of iCloud on your iPhone, iPad, iPod touch, Apple TV, or Mac - Apple Support

Read this support article to learn how to sign in with your Apple ID on different devices--> Sign in with your Apple ID - Apple Support

For an Apple Mobile device:

1. Open the Settings app.

2. Tap Sign in to your [device].

3. Enter your Apple ID and password.

4. If prompted, enter the six-digit verification code sent to your trusted device or phone number and complete sign in.