Your unlock request was denied because your phone is no longer active on an AT&T account

That's a 2013 phone.  AT&T hasn't supported that phone in many years and may not have any unlock codes to give you.   There's also very few places in the world that phone will ever work because it has limited connectivity

It's not voice over LTE capable. 

This is why phones should be unlocked while they are still actively being used and as soon as they are eligible.  

I suspect the denial wording is incorrect. I don't know why AT&T doesn't just say it doesn't have unlock codes.  You can call AT&T and ask for tech support.  

That's a 2013 phone.  AT&T hasn't supported that phone in many years and may not have any unlock codes to give you.   There's also very few places in the world that phone will ever work because it has limited connectivity

So what? This phone still can be used outside USA and within the USA with foreign SIM cards in roaming on T-Mobile network.

IIt's not voice over LTE capable. 

As I said, this phone still can be used outside USA and within the USA with foreign SIM cards in roaming on T-Mobile network.

In any case AT&T must provide unlock code. They can do it because I got unlock codes for other Lumia 1020.

In any case AT&T must provide unlock code.

There is no “must”. Unlock codes come from the manufacturer. ATT can’t provide something they don’t have, if indeed they don’t have it. If they do have the code, it will probably take an FCC complaint to get it.

They may not have unlock codes for some phones (not for Lumia 1020, as I said AT&T still provides unlock codes for Lumias).

But this specific error is a technical error with AT&T Unlock Portal.

Update: after filing complaint to FCC, AT&T contacted me and provided unlock code

H, I’m trying to unlock my 12promax and I’m getting this error;

Your_unlock_request_was_denied_because_your_phone_is_no_longer_active_on_an_AT&T_account

Hello

I’m trying to unlock my iphone 12promax and I’m getting this error, any help ? 

@Ivy1 

And is that true ?

@Ivy1 , file complaint to FCC. I got unlock code after I filed report to FCC.