[Dovecot] Autocreate plugin

I've tried to use the autocreate plugin in order to autosubscribe users
to public namespaces.

namespace public { prefix = Public2/ separator = / location = maildir:/var/Public2:INDEX=~/Maildir/p-idx:CONTROL=~/Maildir/p-crtl hidden=no subscriptions=no inbox = no list=no }

with

plugin { autocreate = Spam autosubscribe = Spam autosubscribe1 = Public2/News autosubscribe2 = Public2/Shorewall }

the plugin works alright with the Spam maildir, but not with the namespaces. Is this possible ???

Thanks Harry.