Used iPhone - Maximum number of Apple ID reached
"Cannot Sign In
The maximum number of free accounts have been activated on this device."
This turns out someone has used up before I bought an used iPhone which I couldn't use iCloud on this device anymore.
Other one I learned when I tried out by creating new Apple ID on this device the alert came up said:
"Account Limit Reached
This device is no longer eligible for creating a free iCloud account."