A quick community workaround is to force the connection after the message appears.
On modern operating systems like Windows 10/11, the game may fail to write the CD key to the correct registry path during installation. call of duty 2 awaiting key code authorization
Open the game console by pressing the key (usually next to the "1"). Type /reconnect and press Enter. A quick community workaround is to force the
Understanding why this error happens is the first step toward fixing it: call of duty 2 awaiting key code authorization