[TYPO3] Front End User Registration

[typo3]

I've got the Front End User Registration extension installed and it works 
except for assigning a user group to the user. I have: 

plugin.tx_srfeuserregister_pi1.userGroupUponRegistration = 1
plugin.tx_srfeuserregister_pi1.userGroupAfterAcceptation = 1
plugin.tx_srfeuserregister_pi1.userGroupAfterConfirmation = 1 


But they don't work. What else do I need to do? 

 

Ben Jirka