When PPpoe server uses radius, the concurrent online quantity policy of the same user name is not issued to Vyos to take effect
It seems that after the first ppp session with the user name is established, the second ppp request always fails to authenticate, rather than showing that the number of concurrent online replies from the radius server exceeds the limit?
The session control can be duplicated by default or disable

vyos@SH-QP-FYC01.C3558.internal:~$ show version
Version: VyOS 2025.05.11-0020-rolling
Release train: current
Release flavor: generic

Built by: autobuild@vyos.net
Built on: Sun 11 May 2025 00:20 UTC
Build UUID: 43e4dff6-1adc-4b4a-bd5a-d221af3ecee0
Build commit ID: 247e8103392942

Architecture: x86_64
Boot via: installed image
System type: bare metal
Secure Boot: disabled

Hardware vendor: Dell EMC
Hardware model: VEP1425-V210
Hardware S/N: <Deleted>
Hardware UUID: <Deleted>

Copyright: VyOS maintainers and contributors
vyos@SH-QP-FYC01.C3558.internal:~$