Force TFS to sync with Active Directory
Changes you make to local or Active Directory groups do not get reflected in TFS immediately. Instead, TFS will synchronize those groups regularily (by default every hour).

Known workarounds:
- You can re-add the security group in TFS, this will trigger a identity synchronization.
- In TFS 2005/2008: you could restart IIS or the TFS App Pool to force an identity synchronization (does not work for TFS 2010).
- Using the JobService webservice, you can queue the identity synchronization job.
- Or use this tool to trigger the web service:

(Note: The user needs to have the 'Queue background jobs' permission on TFS)
Download the tool from here: TfsSyncIdentities.exe (.ZIP, 7,78 KB)
Update:
- You can specify "/status" to only query the time of the last identity synchronization.
(only requires 'View background job information' permission on TFS)