Roblox error code 264, which signifies “Same Account Launched with a different device,” indicates that your Roblox account has been accessed and a game launched from another device. As a result, you are unable to join the server at that moment. The message appears clear-cut, doesn’t it?
Fixing error 264 in Roblox isn't as difficult as you might think, as you can usually fix it by logging out of your account. If that doesn't work, though, we've given instructions for other potential fixes as well. Be sure to test Roblox works again after each section below—that way...