Hi, here's all the relevant EM error codes. Like Chad suggested (5*), have a look at the service URL to make sure it's correct (make sure it's resolving to IP not DNS).
Otherwise, this sounds like a database issue or a profile problem (have you checked they are associated properly in CCMAdmin)?
Have a look at the link at the bottom of the page, it has some useful information that should help you..
Error Code & Description
[0]
Unknown Error
[1]
XML Validation Error: Because the request or query was incorrectly formed, it cannot be properly processed.
[2]
Authentication Error: An error occurred in the authentication process, and the validity of the appID and appPassword that were submitted cannot be confirmed.
[3]
Invalid Authentication: The appID and/or appPassword that were provided are incorrect.
[4]
Policy Validation Error: Some generic issue exists regarding determination whether the request is allowed.
[5]
Request Denied: The request has been denied (failed Policy Validation) for one or more reasons.
[6]
Database Error: The Extension Mobility service received an error while trying to communicate with the database.
[7]
AutoLogout Setup Error: The system could not communicate with the AutoLogout service.
[8]
Query Type Unknown: The system could not determine whether the query is Device-User or User-Devices.
[9]
DirUser Creation Error: Directory integration error occurred.
[10]
Proxy Authentication Not Allowed: the appID that is specified does not have rights to log in or log out other users.
[11]
Device Does Not Exist: The specified device for login or logout does not exist in the system.
[12]
Device Profile Does Not Exist: Either a profile was specified that does not exist or no Logout Device Profile was configured for the specified user.
[18]
Device Already Logged In: The system could not log in to the specified device because a user is already logged in.
[19]
Device Not Logged In: Could not log out of the specified device because no user is logged in.
[20]
Get Device Hoteling Flag Error: The system could not determine whether the device allows Cisco Extension Mobility (also called "hoteling").
[21]
Get Device Hoteling Status Error: The system could not determine whether these is a user currently is logged in.
[22]
Device Does Not Allow Extension Mobility: The device that is specified is not configured for Extension Mobility.
[23]
User Does Not Exist: The userID that was entered for login does not exist in the system.
[25]
User Already Logged In Elsewhere: The system denied the0 login because the specified user is already logged in to a different device.
Troubleshooting Extension Mobility in Cisco CallManager:
http://www.cisco.com/en/US/products/sw/voicesw/ps556/products_tech_note09186a0080093e72.shtml#error6
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