Welcome to your interview.
The question is on your right: Root Cause for Low Adoption. Take a moment with it first.
Talk your thinking through with me if you like - when you're confident, submit your answer and I'll grade it like a real screen (7/10 or better passes). Discussion and graded submissions share your five interviewer interactions, so spend them well.
If a major accounting partner is experiencing low adoption rates of Xero among their staff, what framework would you use to identify the root cause and implement a training plan?