Panellist apps not working correctly after forced update

We are experiencing a very odd technical difficulty on the start of webinars over multiple accounts. Our Invited panellists (who are the main presenters in our webinars), who are all experienced Zoom users, click the link to access the webinar, are having a forced update and then are unable to get into the Zoom app on their computers or access the webinar. They can get on on a different device or through the browser using the meeting code, but this causes a very limiting issue with regard to smooth screen sharing. HAs anyone else had similar? First issue experienced on 09/11/2023 and then twice again on 14/11/2023.