If you encounter this issue, run the following command on the HMC:

lssyscfg -r sys -F name,type_model,serial_num,ipaddr

If the Managed Server name contains spaces, rename it to remove all spaces.

To rename a Managed Server:

1. Login to the HMC.
2. Choose the corresponding server from the Servers list.
3. Select Advanced System Management (ASM).
4. Login to ASM.
5. Expand the System Configuration option.
6. From the left menu, select System Name.
7. Change the Name and save.