MS Live Events Public AND External App > not possible/supported. Why and are there solutions?

Lars Roth Great post thank you. To add one piece more information or to add clarity on step 5. 

1. To add external participants, I created a teams group > added the members

2. The members received an email from Microsoft > click the link > downloaded authenticator (I think google authenticator works some how) > external person follows steps and authenticates

3. When these steps are completed, I can go ahead > go to the teams application > go to  calendar > click the arrow beside "new meeting" > select Live event

4. Then I need to enter the title first > then go to the next page select " Org-wide"

5. Then, select " An external app or device"

6. Then I go back and HERE is one issue, when I enter the email of an external person to add them as a presenter or producer, it doesn't show up which confirms what another person in this thread already said about internal use only. I also went to Stream (where we get the rtmp link for the encoder or software such as wirecast pro), and I wasn't able to search or add external participants (Stream is only internal is my understanding but I could be wrong). 

Solution: It doesn't seem there is a solution yet when I add external presenters or attendees (I could be wrong). The above should work if it's only internal. If its only internal and I need a third party to support the event, the rtmp link (that can be gathered in MS Stream > my content > video > encoder setup) can be shared with the vendor supporting the wirecast pro or other solution I would assume (testing today actually). 

Good luck!