Send group email to all participants not working

We sometimes need to send all the participants in a scheduled Zoom class a message from the teacher. The group email just sends you to a blank page.

Bookings Calendar>Manage Participants - click on Client to send a message to all the participants and the “Send Email” button just takes you to a blank page. Is there something wrong with the code?

Product:
Wix Studio

Thank you very much for any help.