fresh self-hosted installation - registration doesn't work?

hi!

I'm currently evaluating Zitadel, and I can't get user self-registration working, so this must be a bug?

I'm using latest docker-compose config as described here, https://zitadel.com/docs/self-hosting/deploy/compose/
and example vue application without changes - https://github.com/zitadel/zitadel-vue

When i click "login" in the app, it correctly sends me to the zitadel sso and offers to choose an account, log in, or sign up.
It lets me go to the registration form, but no matter what i do, "continue" button on the registration page is always disabled...
I know i correctly configured client/project id. When i disable "allow registration" in the default org settings, the link to sign up form disappears.
maybe it has something to do with domain discovery or org prefixing?