Hello@ster
This is because the user goes offline due to charging failure. Authentication and accounting are configured on the S series switches, but the switch does not support accounting. In this case, you need to configure the policy for keeping users online when accounting fails. The configuration method is as follows:
[HUAWEI] aaa
[HUAWEI-aaa] accounting-scheme scheme1
[HUAWEI-aaa-accounting-scheme1] accounting start-fail online