[pam_radius_auth] Is it possible that an account might be workable, while the user is not available on device.

Hello， I am new to freeradius and trying pam_radius_auth now. Is it possible that an account might be workable, while the user is not available on device(Ubuntu PC). It is always failed in my test environmen. Thank you for your time in any case. zhangguo200588@126.com