Sometimes a presentation doesn’t “work.”
Sometimes there’s no connection with the audience.
Sometimes the presenter talks more to themselves than they listen to the crowd.
Sometimes questions aren’t asked (or answered) by the audience or the presenter.
Sometimes there is no active listening on the part of the audience.
Sometimes there is no active listening on the part of the presenter.
Sometimes the content is not what the audience expected.
Sometimes the content is not what the presenter expected.
Sometimes personalities clash.
Sometimes the content is exactly what the audience needs to hear, but not in the way that they need to hear it.
Sometimes the presentation is just a failure, and there’s nothing that the audience (or the presenter) can do at all to “fix” it.
Sometimes trying again, with a different audience, is enough.