How can I remove iPhone Activation Lock permanently?

Only the “currently registered w/ Apple” owner of the phone can release the activation lock.

If you can’t obtain that owner’s cooperation, the phone will NEVER work for you.

How to remove Activation Lock - Apple Support

The All Too Common SAD Reality of Buying … - Apple Community

The following information appears under the user's Bio:

I ** currently in the process of attempting to restore my iPhone to its factory settings; however, i have encountered an activation lock on the screen, impending the reset, i want to assure you that my iCloud account is clear of any issues, and i possess both the purchase receipt and invoice for the iPhone as supporting documentation. you prompt assistance in resolving the matter professionally would be greatly appreciated.)

So, the user is talking about their personal phone and Apple Account. Not sure how much this might help though.

Interesting place to post relevant info … 🤔

So … armed with the informational link, he/she should be all set.