Related problem: https://help.nextcloud.com/t/how-to-install-activate-apps-like-mail-contacts-and-calendar/5378/10
This seems to be a current problem with the new app store.
Related problem: https://help.nextcloud.com/t/how-to-install-activate-apps-like-mail-contacts-and-calendar/5378/10
This seems to be a current problem with the new app store.