The dog ate my key Passat B7 118TSI

[Greenways]

The new pup decided that our B7 Passat 118TSI key looked tasty and gave it a pretty good chew to the point where it would no longer fit in the key slot

We dismantled the key and were able to remove the battery printed circuit board which did not appear to have any damage.

We purchased a new key shell via EBay and installed the original board and battery in the replacement shell.

Lock and unlock work fine, However when the replacement key is in the key slot I am met with the Message IMMOBILISER ACTIVE/

Spare fob works fine.

Any suggestions as to why the replacement key won't work or suggested fixes will be most appreciated.

Found this video on line
Volkswagen Immoblizer active no crank not start easy solution. - YouTube

Can anyone confirm that this works?