We encountered the same issue on CUCM 14.0.1.11005-1 with (2) servers in the cluster.After rebooting the pub (no changes), the alert   "RTMT fails to collect the data, Error: AMC: data collector not ready" shows up.TAC recommended restarting the foll...

me too CUCM 10.5 still had the same requirement! Worth checking and ensuring you have something in the last name field! Thanks for the post!