Aruba AP-270 series mesh AP unable to form uplink

Problem: AP-270 (had this happen on a 274 and a 275) does not join the controller. I saw this on both a Mesh Portal and Mesh Point. After verifying proper power, consoling into the ap showed the following logs at the end of the boot cycle: ~ # [   40.013529] wl0: set MESH_ID(mesh-secshack, 13) [  …