Campaign Monitor interview questions

The first round is HM hire, which mainly talks about your past experience the expectations of this role, and some of the behavior questions, it is easy to get pass to the next round. The technical round is about 2 sections, the first section is an easy-medium Leetcode question, and the second part is about a knowledge check around the basics, cloud services, and distributed system knowledge. I cleared the code question but failed on the knowledge question