Why a message is displayed indicating that you are not authorized when you configure the VTY user interface and user console interface

The default user level of the user console interface is 15. Only the user at level 15 can access the user console interface. The default user level of the VTY user interface is 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
Symptom:
[huawei]user-interface vty 0 4
Error: The user level is too low.

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