I am trying to install SQL 2012 clustered services (first install of SQL on this MS Server 2012R2 cluster). The AD objects have already been created (Nodes, Cluster Alias, and SQL network name). This is a requirement of the network I work in. I do not have ability to create domain objects. I have successfully installed several other similar clusters on this network, both SQL 2012 and SQL 2014. In this case, however, I get an error:

sql server failover cluster instance name already exists clustered resource

Of course the network name exists, but it has in every other case as well. I checked the AD listing, and there is only one domain object with that name, and it belongs to me. Why then am I getting this error??

I have seen multiple listings of this same error, but nothing that will resolve my situation.