Have you tried having the panelists join a regular zoom meeting and sending out your output to Zoom via NDI so that the webinar experience is "cleaner"? You likely would need VB cable or something to bring the audio over

I do one a few times a year where the presenters are on zoom with the Vmix integration then we send out to a teams webinar /town hall or whatever it’s called this week , the teams producer gui is allows just our feed to be broadcast

Update
our problems added up - the clean feed is/was later our smallest problem. Lucky for us we got the Zoom Suoltion Team that help us understand that we can't use vMix as intendet.
But this should change in a few weeks because Zoom is working so that 3rd party vendors get a better connection (API)


We had/have several mission-critical issues regarding the integration of vMix within our Zoom (incl. Webinar Plus and Production Studio) environment. Below is the worst.


1. Clean-Feed Constraints and Screen Share Routing

Maintaining a professional "Clean-Feed" currently presents a conflict between visual integrity and audio control:

Without Production Studio (Image 1): Screen sharing results in redundant displays. The share appears both as a native Zoom overlay and within the vMix signal, making a clean broadcast feed impossible.
With Production Studio (Image 2): While this allows for a clean feed (see config in Images 3 & 4), it breaks the audio workflow. Screen share audio is not transmitted to the vMix ingest unless the share is added as an active source in a Production Studio scene.
The Conflict: Adding the share directly to the Studio forces it "Live" for attendees immediately, bypassing vMix as the production switcher and eliminating our ability to manage the layout.
Requirement: Screen share audio should be streamed to vMix as a persistent ingest source, identical to how speaker audio is handled (independent of the active scene status).


2. Audio/Video Desynchronization (PRIMARY ISSUE)

The integration of vMix introduces a massive A/V offset of approximately 500ms.

Root Cause: Zoom defaults to the direct audio feed from the presenter/source instead of using the processed audio return from vMix.
Impact: While video and audio are perfectly synced within vMix, the attendee hears the "raw" Zoom audio nearly 0.5s before the processed vMix video arrives. This occurs both with and without Production Studio active.
Requirement: An option to force Zoom to prioritize the vMix audio return as the master for the webinar output.




Current Workaround and Limitations

To maintain production quality, we are forced to use a workaround:
Presenters join a separate, private Zoom Meeting.

vMix captures this meeting and processes the signals.
The vMix output is sent via a physical Capture Card (or NDI) to a separate Host PC running the actual Webinar.
Major Drawback: Since presenters are in a separate meeting, they have no access to Webinar interactive features (Chat, Q&A, Polls), which significantly degrades the event quality.
optional but to limited: only use Production Studio



And closing on a good note:
If you only achive 5fps while screen sharing and only see a greyd out "optimize for video" option .

We identified why the higher frame rate is always greyed out (in Webinars) -
• UI Constraints: The "Optimize for Video Clip" toggle is only available when sharing permissions are set to "One person at a time."
this is NOT a default setting and has to be set manually