Why does the system display a message indicating that there is no right when you configure user-interface vty or user-interface console

Users on the console port are at level 15. Only the user at level 15 can access the user console interface. Users on the VTY user interface at level 0. If the user level is upgraded to level 15 using the following command, the system displays a message indicating that the user level is too low.
user-interface vty 0 4
authentication-mode aaa
user privilege level 15
protocol inbound ssh

[huawei]user-interface vty 0 4
Error: The user level is too low.

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