尽管将ProjectUser设置为AUTH_USER_MODEL，但您在admin中将其注册为标准模型，而不是用户模型.您需要使用用户admin，如

Although you set ProjectUser to be the AUTH_USER_MODEL, you registered it in the admin as a standard model, not the user one. You need to use the user admin, as shown in the docs, since this takes care of hashing the password:

from django.contrib.auth.admin import UserAdmin

admin.site.register(ProjectUser, UserAdmin)

您需要先删除并重新创建通过管理员生成的用户，然后再进行更改.

You'll need to delete and recreate the users you generated via the admin before changing this.