Using a basic RADIUS configuration will not enable admin-level but only keep operator level.
set system login radius server 172.16.100.10 key 'VyOSsecretVyOS' set system login radius source-address '172.18.254.201'
Creating directory '/home/vyos_admin'. Linux vyos 4.19.145-amd64-vyos #1 SMP Mon Sep 14 05:08:01 UTC 2020 x86_64 The programs included with the Debian GNU/Linux system are free software; the exact distribution terms for each program are described in the individual files in /usr/share/doc/*/copyright. Debian GNU/Linux comes with ABSOLUTELY NO WARRANTY, to the extent permitted by applicable law. radius_user@vyos>
Logfiles
Sep 15 19:14:57 vyos sshd[2599]: pam_unix(sshd:session): session opened for user vyos_admin by (uid=0) Sep 15 19:15:04 vyos sshd[2610]: Received disconnect from ::1 port 49004:11: disconnected by user Sep 15 19:15:04 vyos sshd[2610]: Disconnected from user vyos_admin ::1 port 49004 Sep 15 19:15:04 vyos sshd[2599]: pam_unix(sshd:session): session closed for user vyos_admin
So the username is passed in correctly, but the shell is not spawn correctly. It used to work with 1.3-rolling-202008301049