I am moving some group policies to a new server. When I move the group
policy folder to the new server (the data volume on a cluster), the
workstation associated policy no longer is applied.

Their old location was \\ServerA\SYS\PUBLIC\GROUPPOLICIES

I am not moving it to a clusterd volume:

The [public] has read/filescan rights to "GROUPPOLICIES"

When the user logs in they can browse to
\\Data_Server\data\GROUPPOLICIES. They can also ping the server.

The server has been added to the local hosts file.

Any ideas what I might be doing wrong?