OpenVPN & VPN IPSEC site-to-site

[lahirurd]

Hi,
I'm having hard time finding a solution to my problem..
I have an IPSEC site-to-site VPN which is working without any issues. I also have a OpenVPN setup for mobile clients which is working as well.

Firewall OPNSense is on site A.
Site A & B are connected via IPSEC site-to-site VPN setup.
Site A also provides OPenVPN for mobile clients.

The problem I have is when mobile users get connected to site A via OPenVPN, they aren't able to access to site B

Site A : 192.168.200.0/24
Site B : 192.168.100.0/24
OpenVPN : 192.168.150.0/24

If someone can help me with this, It would be great!

Thanks,