The key is typically found on the back of the manual or inside the DVD case.
The "key" wasn't a 20-digit code he had lost. It was a digital handshake.
If you see a listing for for $19.99, save your money. The seller is exploiting nostalgia. ghost recon advanced warfighter multiplayer id key new
For further community support or to find players for tactical co-op, the GhostRecon.net forums
If you are stuck at the main menu asking for a key, follow this flow: The key is typically found on the back
: Go to Windows Security > Virus & Threat Protection . Look for recently quarantined files from the game's installation directory.
: If you own the Steam version, try running Steam as an Administrator with Ubisoft Connect closed before launching the game. This can sometimes bypass the key prompt. If you see a listing for for $19
You might be searching for a "new" key because you bought a used copy without a code, or your old key is being rejected. Here is the modern reality: