ds: dsacls is driving me crazy!

here's a little background. i'm trying to delegate permissions for create/delete computer objects on a given ou. i get back this nonsensical response on a command i know i've issued before but can't seem to make it work! seen this before? here's the command: dsacls "OU=Computers,OU=General,DC=Company,DC=com" /G "Company\SupportGuy:CCDC;Computer" this is the response:

No GUID Found for Computer The parameter is incorrect. The command failed to complete successfully.

apparently case does matter in some cases (intended). capitalizing Computer causes the output to fail. why? i guess dsacls is case sensitive. it's looking for an object called Computer. switching it to lowercase computer works just fine.