That message is unrelated to IdentD.
Some networks have a +R (or +r) channel mode which means only registered/identified users can join - not all networks have this.
The problem might be a desynch. Reconnect to a different server (try /links for a list) and then identify again. Also make sure you use your registered nickname and that you don't just identify from a nickname different from your registered one.
Their may be other factors involved for the network you use - we are not affiliated with any one channel, server or network and so can't possible know about all of them. The best thing to do is to ask in the network's #Help channel or check out the network's website. If you don't know the website address, search Google
Best of luck