Erase All Content and Settings - What next?

When I was in your situation at one point, I had to go to the Apple Find My website and remove the Apple device from my iCloud account there. Then when I connected the Apple device to the internet, the iCloud login went away.

mc2hip503 Said:

"Erase All Content and Settings - What next?: [...]This is the issue: the phone that I am trying to erase is not providing a type in area for the code I am receiving on the new one & the old one just freezes on the same page.[...]"

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Getting Out of a Login Loop:

Perform as instructed here, including the iCloud logout session: What to do Before you Sell, Give Away, or Trade in your iPhone or iPad - Apple Support. Did you log out of iCloud prior to resetting this? That is what you always must do, prior to Gavin this away. If so, then it is still logged in to your account.

So, Verify this is NOT your Device:

Verify this device is no longer logged in to your account, by using this link: Check your Apple ID Device List to See where you're Signed in - Apple Support