Empty Email Fields

Hello
I am using Stageshow 9.7, php version 7.4. Creating seating plans, forms etc. works fine. When completing a reservation, all fields, seats etc. can be filled in correctly. But when sending the tickets to the email address indicated in the reservation field, the tickets are not emailed. The following message appears: ?Tickets reserved – email confirmation sent to …..? and no email address is indicated. I.e., the reservation was not sent to the indicated email address in the reservation form. The administrator does not receive a confirmation.
In the backend, under sales, the name fields are empty. Transaction date, status, prices, seats are ok.
Any help is appreciated. Thank you.