ros code

:local ipa;
:local ip;
:foreach ip in=[/ip firewall address-list find] do={
    :put [/ppp active find address=[get $ip address]];
}

ros code

[admin@gw-13-02] /ip firewall> address-list print 
Flags: X - disabled, D - dynamic 
 #   LIST                                         ADDRESS                        
 0 D nat-188.116.15.57                            192.168.100.254

ros code

[admin@gw-13-02] /ppp active> print                  
Flags: R - radius 
 #   NAME         SERVICE CALLER-ID         ADDRESS         UPTIME   ENCODING    
 0   5555         sstp    xxxxxxxxxxxx     192.168.100.254   49m44s

ros code

/system script> run test01


[admin@

ros code

:foreach ip in=[/ip firewall address-list find] do={
    :put [/ppp active find address=[get $ip address]];
}

interrupted
           invalid value for argument address

ros code

:foreach ip in=[/ip firewall address-list find] do={
  :local add [get $ip address]
  :put [/ppp active find address=$add];
}