No valid A or AAAA records could be ultimately resolved for webcam.mba.ac.uk. This means that Let's Encrypt would not be able to to connect to your domain to perform HTTP validation, since it would not know where to connect to.
No A or AAAA records found.
1 Certificates contributing to rate limits for this domain
Serial: 333943741801062378016914140879826487471951
NotBefore: 2022-08-11 14:51:16 +0000 UTC
Names: [gitserver.mba.ac.uk]