Hi @jeff.qiu
I am sorry about the delayed response to your inquiry!
The issue appears to be caused by the fact that your users are not being redirected to the login page or to the /authorize endpoint but instead are being prompted to access it directly.
As the error message states, you will need to configure and Application Login URI inside your Application Settings or configure your application to redirect the users as mentioned above.
If you have any other questions, let me know!
Kind Regards,
Nik