Can't remove external presenter in Microsoft Teams Webinar

Hello,

I am trying to remove some external presenters from my Microsoft Teams webinar, but clicking the 'X' button - which normally works - is not removing them.

It is likely worth noting that these external presenters who can't be removed are in fact, for some reason, duplicates. In other words, there are three real presenters here but they are each entered twice. There were two other external presenters that I was able to remove, and they did not have duplicate entries. I'm not sure if this has something to do with it.

I have tried this on both the desktop client and the web app. Please let me know how this can be solved.

Many thanks,