Closed captioning for a participant

Hi!

I have enabled my participant for closed captioning on their end within their zoom account.  I have it enabled as the host on my account.  However, when I do a test with the participant, the closed captioning doesn't come up for them but it does come up for me.  How can I make it so that my zoom invites enable this particular deaf person to see what I am saying using closed captioning correctly?  Is it that when