LearnUpon webinar errors

[RebeccaMJigsaw]

While running a webinar through LearnUpon LMS, some of our learners got the following screen:

When checking with LU, they said it meant that our Zoom account that's linked with LU wasn't set up for webinars, but this isn't the case as we definitely are, and about 200 other users accessed the webinar without issue. LearnUpon Customer service then said to contact Zoom support.

Anyone have any ideas why the integration might not have worked?

Thanks, 

Rebecca