The first thing is to update your version of Certbot. Version 2.3 fixed a bug which looks exactly like what you show: Certbot 2.3.0 Release
The current version is 2.11
This bug just prevents showing why the cert request failed. So, something else is failing too. But, it will be very helpful to know the original reason for failing once you update.
The Certbot team recommend using the snap install so that it stays updated. You can follow the instructions for Debian 10