Lumia 640 asks for PUK unlock code

[elvirr]

ATT Microsoft Lumia 640 GoPhone.
Orderer and received unlock code, but as I enter the unlocking code the phone asks for phone PUK unlock code, which I don't have and ATT support doesn't know what am I talking about. When i try to enter wrong unlock code, the counter goes to 4 and it starts from 10 again.
When I enter ##7820# the phone shows like it's unlocked but it won't accept the sim card.

https://i.imgsafe.org/ad7aa1dbf0.jpg
https://i.imgsafe.org/ad7a3966ac.jpg

https://youtu.be/-A8VZ2LA9wg
https://youtu.be/aW0Xcw2-wz0

 

[v535]

It appears you need to contact ATT and get PUK code.

 

[Lee Power]

Asking for a PUK code means the sim card is locked by to many wrong SIM PIN attempts. Contact you service provider for your PUK code to unlock the SIM card.

 

[elvirr]

Nso matter shich sim card I use the phone asks for PUK code, so it's not the card.

 

[westnz]

I have same error, any luck yet? I read somewhere in a forum about entering a wrong unlock code 10 times to get to a real unlock screen then enter puk code there? have you tried that?

 

[tummus]

Same here. I have a Lumia 735.

The problem is that it keeps 9 attemps left, no matter what. So that's not an option for me.

The unlock code is correct because I dialed ##7820# and unlocked the lock image by entering it. However, the phone still requires the unlock code when I use another carrier SIM. (Works fine with original operator SIM, but is not mine)

 

[westnz]

I couldn't get a result from Microsoft either only a send in which isn't worth it as I'm in New Zealand and I would have to send it by my own cost back to USA.