Launch GRAW, navigate to the multiplayer menu, and select instead of Internet/Online.

The primary reason players encounter an "Invalid ID" or are blocked from finishing the installation is due to modern security software misidentifying legacy files.

127.0.0.1 gdn.spynet.org 127.0.0.1 master.gamespy.com 127.0.0.1 gsp3.gamespy.com

Insert your retail DVD into the disc drive but exit the autorun splash window.

Have you found a different method that works for the Steam Deck or Linux? Join the discussion on the r/GhostRecon subreddit. Stay frosty.

While there is no "official" update from Ubisoft, the Ghost Recon Advanced Warfighter (GRAW)

Ensure your Windows user profile has full ownership rights over the Ubisoft folder within the Registry Editor.

Look for the validated community-made executable patched for modern network play.

Even with the above fixes, you might run into other problems.

Extract the contents into your main GRAW directory, overwriting the original files when prompted.

Resolving the Ghost Recon Advanced Warfighter Multiplayer ID Key Issue