How to redirect traffic from squid to vpn?

I have a windows machine with a squid server and VPN client connection(which is not the default gateway)

What I want is to redirect some traffic from squid to my default ethernet connection and some to VPN.

Ethernet adapter Ethernet:

   Connection-specific DNS Suffix  . :
   IPv4 Address. . . . . . . . . . . : 192.168.100.11
   Subnet Mask . . . . . . . . . . . : 255.255.255.0
   Default Gateway . . . . . . . . . : 192.168.100.1

PPP adapter vpn_conn:

   Connection-specific DNS Suffix  . :
   IPv4 Address. . . . . . . . . . . : 172.16.3.33
   Subnet Mask . . . . . . . . . . . : 255.255.255.255
   Default Gateway . . . . . . . . . :

squid conf

http_port 2003
acl  user3_acl  myport 2003
tcp_outgoing_address 172.16.3.33 user3_acl

http_port 2004
acl  user4_acl  myport 2004

2004 port works as expected through my Ethernet adapter, but redirect to vpn doesn’t work,

the log contains

1638648992.630     75 33.33.333.333 NONE/503 0 CONNECT docs.microsoft.com:443 - HIER_NONE/- -