As per this article How to delete your Apple ID account - Apple Support
When your Apple ID account is deleted, your account details and the data associated with your Apple ID are permanently deleted from Apple’s servers. You can't sign in to your account, and you won’t be able to access any data, content, or services that were associated with your Apple ID.
Before you request deletion of your Apple ID
We recommend that you take a few steps before you request deletion of your Apple ID.
- Back up the data that you store in iCloud—including content for any Apple or third-party apps that store data using iCloud—to a place that doesn’t use your Apple ID for access.
- Download any DRM-free purchases, iTunes Match tracks that you don’t have copies of, and any other music and media.
- Review any active subscriptions. When your account is deleted, subscriptions are canceled at the end of their billing cycles.
- Save copies of any Apple-related information that you currently need or expect to need.
- Make sure that you sign out of all your devices to avoid issues with apps that use your Apple ID account or iCloud. After your account is deleted, you can't sign out of iCloud or turn off Find My iPhone Activation Lock on your devices. If you forget to sign out, you might not be able to use your device when your account is deleted.
Note : you have started the process of deleting the account from server , however once again tried to sign in with your Apple ID and password from Mac at www.icloud.com using 2FA , also the signed in devices like iPhone / iPad are not removed .
You have to stop it , by revealing alfa numeric code to apple care senior advisors before 30 days , once the account is recovered , then follow the complete steps in the article to remove the account from server if you wish so .