I changed the PR description a bit so its easier to review.

This is solving the original report, but as far as I see, there are others fields that aren't in the MeetingCopyForm that at least I expected to see there. (Sorry that I didn't add it to the original bug report!!)

This is the "Duplicate meeting" form:

And this is the original Edit form with all the differences highlighted:

As a summary:

• The required validation for type
• The help texts
• The attributes: :iframe_embed_type, :comments_enabled, :comments_start_time, :comments_end_time, :iframe_access_level, :registration_type, :registration_url, :category

As this is getting bigger than expected initially, I see two options:

1. If you have the time/availability, for you to fix that in these new details in this same PR
2. If not, we can accept it as is (technically, its fixing the original report). Then I could tackle these changes and fix it in another PR.

So, whatever you prefer @alecslupu, feel free to say no if you don't have the time.

@andreslucena , the following extra fields have been added :

            iframe_embed_type: meeting.iframe_embed_type,
            iframe_access_level: meeting.iframe_access_level,
            comments_enabled: meeting.comments_enabled,
            comments_start_time: meeting.comments_start_time,
            comments_end_time: meeting.comments_end_time,
            registration_type: meeting.registration_type,
            registration_url: meeting.registration_url,
            attending_organizations: meeting.attending_organizations,
            reserved_slots: meeting.reserved_slots,
            customize_registration_email: meeting.customize_registration_email,
            registration_form_enabled: meeting.registration_form_enabled,
            registration_email_custom_content: meeting.registration_email_custom_content

There may be some others like audio_url, video_url

You're adding them to the Command, but as far as I understand they also need to be added in the Form (https://github.com/decidim/decidim/blob/develop/decidim-meetings/app/commands/decidim/meetings/admin/copy_meeting.rb). There should also be the required validation.

The help texts (arrows in my last screenshot) are still missing. They need to be added at https://github.com/decidim/decidim/tree/develop/decidim-meetings/app/views/decidim/meetings/admin/meeting_copies/_form.html.erb

We would also need specs for both classes (Form and Command).

Thanks!