How do I recover a blocked iCloud account on iPhone?

You can use Account Recovery and access to the email address is not required.

How to use account recovery when you can’t reset your Apple Account password - Apple Support

Priezt_ wrote:

Please I need help

How can we fix this?

My friend’s icloud got blocked for no reason, she forgot her icloud password and now she can’t reset password because the link is being sent to her icloud mail which was also blocked and logged out by apple, her phone number is still available but no link is being sent to it and now it seems there’s no way to recover password or log out the account from the phone to create a new one.

how can she fix this?

She can contact Apple support.