Does not possible to use - in usernames, because CLI script replace it to _
vyos@vyos# run show configuration commands | match local-users set service pppoe-server authentication local-users username [email protected] password 'test' [edit] vyos@vyos# sudo cat /run/accel-pppd/pppoe.chap-secrets # username server password acceptable local IP addresses shaper test@isp_example.com * test *