this is very likely to be a roleplay where you encounter a "typical" client situation, I can think of the following:
- Your partner surprisingly cannot make it to the meeting and you have to step in and lead the meeting - here, the interviewer wants to see that you are able to take on a more senior role than what is normally expected from a new hire (pretend that you already did this 100 times)
- The client is unhappy with the project and wants to discuss the progress - the interviewer wants to see how you deal with a stressful situation and a difficult client (stay calm, listen, but be realistic about what can be achieved on the project)
- You need to tell the client that you cannot hold the deadline - the interviewer wants to see how you communicate bad news while still remaining trustworthy and being perceived as a reliable partner (stay calm, be honest about reasons for failure, present a plan what to do now in order not to jeopardise the entire project)
- You need to sell something - the interviewer wants to test your "sales mode" (be friendly, be convincing, advertise your project but don't force yourself onto the client)
In general, each of these situations will involve a challenge you have to solve - always reflect on the situation: What is important now, what should be avoided, what would I like to see if I was the interviewer.
Hope this helps!