Unable to remove Activation Lock on iPhone 12 Pro Max

Apple does not get involved in any third party sales. A receipt from an Amazon seller is not going to be adequate as even I could print out a receipt that would not prove ownership of any device. You would need an original receipt from Apple or Authorized Apple seller that includes the serial number of the device and would have had to been purchased by you. There is no chance you are going to get the Activation Lock removed.

The 28 character key to access your account is required without another trusted device that is signed into your account. That is an optional layer of security that was set on your account and prevents any other method to reset your password using Account Recovery.

mrxmorgan wrote:

I should ask the Amazon seller to provide me with the original receipt from Apple?

If the Amazon seller did purchase it from Apple or Authorized Apple seller, the receipt is not going to have your name on it to identify you as the owner.

https://al-support.apple.com/#/additional-support

I think Amazon also displays non-authorized resellers. It may depend upon from which seller on Amazon you got it. Unfortunately Apple doesn't make this easy since it doesn't mention online resellers at all (at least nowhere that I have found), only those in physical locations. Find Locations Look up "Amazon" and all it shows you are cellphone stores and Costco-s near Amazon warehouses.

From what I can tell, Apple stopped authorizing online resellers about 8 years ago. There may be some still grandfathered in.

mrxmorgan wrote:

I contacted Apple Support and informed them that I purchased this phone from Amazon. They told me not to worry you needed to provide proof of purchase, including the seller's store name and address. I did that, but they are still giving me a hard time.

They told you the information you needed to send in, but absolutely did not tell you it would be adequate to remove the Activation Lock as that is not a decision they can make. They were simply trying to help you gather the information to send in.

It sounds like Apple has already turned you down — multiple times — after providing all the information to which you had access.

There’s little — anything — we fellow users can do to further assist.