ExpressVPN + openvpn setup

[arthurdaire]

New to OPNsense and having an issue setting up  OpenVPN using the pfsense guide:  https://www.expressvpn.com/support/vpn-setup/pfsense-with-expressvpn-openvpn/#configure.

Issue is while setting up the  Encryption Algorithm , there is no  "AES-256-GCM" option  in the drop down menu .

(cipher AES-256-GCM from expressVPN configuration file).

I know others have managed to set expressVPN on opnsense using the guide above. Any pointers from those that have managed to set it up successfully?  How did you go about this step?

Thanks