Teams Webinar Feature availability in Business Plans

To have the Webinar Feature available you need to run a few PS commands:

Set-CsTeamsMeetingPolicy -Identity Global -AllowMeetingRegistration $True
Set-CsTeamsMeetingPolicy -AllowPrivateMeetingScheduling $True
Set-CsTeamsMeetingPolicy -Identity Global -WhoCanRegister "Everyone"
Set-CsTeamsMeetingPolicy -AllowEngagementReport Enabled

see https://docs.microsoft.com/en-us/microsoftteams/set-up-webinars and
https://docs.microsoft.com/en-us/microsoftteams/teams-powershell-install (to enable the PS to connect)

It may take up to 24 hours until all of the PS commands have been implemented and do take effect. However, you will not have any button that says "Webinar" with a business plan, instead please try to create a webinar like this:

You have to go to the calendar then click new meeting.
Open the drop-down where it says require registration and chose everyone (for a public webinar).
After that, you should see a text link to view registration form you need to schedule a date and time again. (The reason for that is, that you actually can start the meeting before the webinar (itself and you let guests in, for example, to test anything, make last preparations or discuss anything with your speakers).
You have to hit save at the registration form once before the link to the registration page itself will work. And you have to save the actual meeting too before the webinar is set up and the registration page becomes functional. If you do not see the require registration at the top (next to the time zone picker) your tenant might not have received the webinar feature yet.

I do have webinars received, at my tenant (region of my tenant is Germany), I have different licenses assigned to my users.

At the E3 plan, there is a drop-down that clearly shows "Webinar" to start the settings for an MS Teams Webinar. (So I know my tenant is up to date on this).
But users with a Business Standard or Premium plan do not have that drop-down next to new meeting.

So I wonder if the way to set up an MS Teams Webinar is simply different with a Business plan vs. E3 - just as I described above.

My assumption is, you can turn a "regular" meeting by enabling a registration page into a Webinar. At least it looks like this because while I was testing with the Business plan user (even with Business Basic!) that worked and I was able to set up a webinar. This is unconfirmed by Microsoft so far and there is no documentation. All documentation that I found show that next to scheduling a Webinar there is always a Live Event feature option, this, however, is only available in enterprise licenses as the E3 plan.