My panellist hasn't received the invitation email. Where do I find the link to send to him?

I tried several times to re-invite one of the panellists for our webinar to be held tomorrow. He says he hasn't received the emails.

When I click "copy" in the panellist invitation list, it just copies his email address, not the invitation link/email.

Is there somewhere else that I can look to find the panellist invitation link, so that I can send it to him directly?