Call of Duty: Modern Warfare Error Code 664640 is one of the more often encountered issues that the first-person shooter's players have been dealing with for a while now.
When it occurs, Call of Duty: Modern Warfare Error Code 664640 sees the game stuck at fetching your online profile, rendering you unable to get to its menu and start playing.
From what we can tell, Modern Warfare's Error Code 664640 is linked to the game's servers either being offline or having some sort of issue.
Call of Duty: Modern Warfare Error Code 664640
Call of Duty: Modern Warfare Error Code 664640 pops up most frequently around the time when updates are deployed, as that's usually when the servers are taken down. If one of the game's bigger or smaller patches is expected soon, chances are they're the cause of the issue.
Following the same logic, you may also bump into Modern Warfare's Error Code 664640 when the game's servers are also having unexpected issues. Thus, it's always a good idea to double check if the servers are online before doing anything else.
In most cases, Call of Duty: Modern Warfare Error Code 664640 goes away by itself, although, you may have to wait a bit before you can resume playing.
If everything seems to be in order yet you still can't get rid of Error Code 664640, it may be worth going through the steps suggested by publisher Activision in this connection troubleshooting guide.
Call of Duty: Modern Warfare is out now on PC, Xbox One and PS4.
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