OpenVPN setup unable to complete

I had OpenVPN working fine on 2.21 and had used this guide:
https://devops.ionos.com/tutorials/setup-openvpn-on-ipfire-for-road-warriors/

My HD crashed and had to rebuild my entire setup. Am now running 2.25 core 144.

Have tried the same guide, but the screens are a bit different and I never get to a point where the start button is not greyed out.

Is there a newer/better guide? Am I missing something obvious?
(Definitely not a VPN expert…)