This would require editing the template at https://github.com/vyos/vyos-1x/blob/current/data/templates/openvpn/server.conf.tmpl#L77

@shaferstockton can you please post your entire generated openvpn.conf file?

Uploaded the config as generated.

Also recorded log messages and changes I made to the generated config so openvpn would start.

First start I got:

openvpn-vtun0[3276]: Options error: --server-ipv6 is incompatible with 'nopool' option

Removed nopool from server line from generated config.

After that I got:

openvpn-vtun0[3324]: Options error: --server already defines an ifconfig-pool, so you can't also specify --ifconfig-pool explicitly

Removed ifconfig-pool line from generated config.

Can you try any 1.3 rolling version before 2020-10-30 commit c8b7e5c ?

That commit marks the point where a lot of the code I wrote for handling IP pools was - without good reason - removed. I'm personally still running on 1.3-rolling-202008301049 and I can guarantee everything regarding openvpn, including IPv6, works in that version.

If you don't have old isos that you can try, you'll have to wait until the things that were removed and broken with that date, get readded and fixed. Unfortunately, while I had the time to contribute the original code, I don't have the time any more to fix the current mess, as it's not even my fault it got into this state.

I created a PR to solve this specific issue (and some more related to this): https://github.com/vyos/vyos-1x/pull/1637