Hi there,
First of all, congratulations on the progress in the application process thus far!
I would be happy to share my thoughts on your question:
- First of all, I would highly advise you to contact the interviewer again and clarify to know for sure. Only the two of you were in this interview, and if you don't know, it's unlikely that an outside person will know better.
- Moreover, generally speaking though, when an interviewer mentions that your performance "felt rehearsed and lacked creativity", it often means that while your answers were technically correct and well-structured, they may have lacked adaptability to the client situation at hand. Therefore, I would advise you to work on your communication skills and creativity, i.e. your brainstorming skills.
You can find more on this topic here: How to succeed in the final interview round.
If you would like a more detailed discussion on how to best prepare for your upcoming interviews, please don't hesitate to contact me directly.
Best,
Hagen