SSTP Server radius authentication failure

[Saad]

I am setting up sstp server on vyos and trying to authenticate users using radius server. Users are able to authenticate using other services like l2tp but with SSTP I am getting this error

Server

Client

[Saad]

These are my configurations and on more thing is that if mode is set to local. Users can authenticate.

authentication {
local-users {
username xxxxxx {
password xxxxxx
}
}
mode radius
protocols pap
protocols chap
protocols mschap
protocols mschap-v2
radius {
accounting-interim-interval 60
acct-timeout 3
dynamic-author {
key xxxxxx
port 3799
server xxxxx.tld
}
max-try 20
server xxxxx.tld {
acct-port 1813
key xxxxxx
port 1812
}
source-address xxx.xxx.135.174
timeout 3
}
}
client-ip-pool Con-Pool {
range xxx.xxx.206.0/22
}
default-pool Con-Pool
gateway-address xxx.xxx.206.1
log {
level 5
}
max-concurrent-sessions 1
ppp-options {
disable-ccp
ipv6 deny
}
ssl {
ca-certificate CA
certificate Server
}

[Saad]

These are my configurations and on more thing is that if mode is set to local. Users can authenticate.

 authentication {
     local-users {
         username xxxxxx {
             password xxxxxx
         }
     }
     mode radius
     protocols pap
     protocols chap
     protocols mschap
     protocols mschap-v2
     radius {
         accounting-interim-interval 60
         acct-timeout 3
         dynamic-author {
             key xxxxxx
             port 3799
             server xxxxx.tld
         }
         max-try 20
         server xxxxx.tld {
             acct-port 1813
             key xxxxxx
             port 1812
         }
         source-address xxx.xxx.135.174
         timeout 3
     }
 }
 client-ip-pool Con-Pool {
     range xxx.xxx.206.0/22
 }
 default-pool Con-Pool
 gateway-address xxx.xxx.206.1
 log {
     level 5
 }
 max-concurrent-sessions 1
 ppp-options {
     disable-ccp
     ipv6 deny
 }
 ssl {
     ca-certificate CA
     certificate Server
 }

[Saad]

I have also checked radius server. Getting no logs there.

[16again]

Is logging enabled on radius server? And working?
Also , use tcpdump to capture radius packets.

[Saad]

yes logging is enabled on radius. I will share tcpdump of radius. Thanks