Assigning captioning to guest panelist not working in webinar

Never had issues with assigning captions to an attendee outside my organization before, but something seems to have changed.   I've used a live captioner who joins the webinar using their own email ID, I promote them to panelist and assign captions.  When testing captioning in a webinar practice session, realized I am no longer able to assign captioning to someone outside my organization's zoom account.   I can only assign it to panelists within my org. 

Has there been an update or change I've missed?