How do you set up port forwarding with Proton? (Wiki explanation not working)

[NadCat1]

I'm essentially learning which settings need to be set by looking at error messages when the container crashes but there's always one that finally stops me:

ERROR VPN settings: provider settings: port forwarding: port forwarding cannot be enabled: value is not one of the possible choices: custom must be one of private internet access

The same error happens when I try to use OpenVPN only that "custom" is replaced with "protonvpn". Going by the wiki I'd assume that Proton is a valid provider with which you can set up port forwarding, but according to this error message you can only do it with PIA. Is that correct?

[NadCat1]

Maybe I'm a bit thick and should update my software before trying new features... The version I had simply didn't have ProtonVPN yet