Can't add HMC managed server to Uptime Infrastructure Monitor

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.