Form requires users enter some fields and not others, but there’s no notification for users of which ones are required.
There’s also nothing that pops up to show the user which field they missed, or need to fix, when the user hits the next or done button if the form isn’t able to advance.
That’s unusual, normally there will be a red bar around the missing fields.
Would you be able to provide us with the versions for both Discourse and the plugin, and maybe a link to the wizard so we can see for ourselves?