Xbox website not recognizing controller serial numbers.

It says "We didn't recognize this serial number" and I got the number from behind the battery and from the box the controller came in

This worked for the standard controllers but does not work for the two design labs in question. The serial number from the design controllers says not recognized.

I have the same problem : the serial number of my xbox one controller pad is too long for the website.

Thanks for the reply but it requires Surface, Xbox, or Accessory serial number since there's no option for PC Serial Number.

It does not recognize my pc serial number but it needs Surfare , Xbox or Accessory serial number
im trying to add my pc to the device

Thanks Again ill be waiting for a response

Bought it around 2 years ago haven't used it much. I tried to register the controller number, it gave me "We did not recognize this serial number

Check the serial number, then try logging in again..." I asked MS support agents about it, they told me that the controller is not supported anymore. I gave one agent the number they tried to register it to my account they couldn't.