Thanks both for reaching out!
This is a known issue, and we are currently working on a fix. In the meantime, Annika, I have pushed a manual fix to your challenge account, so you should now be able to respond to any review on a Google listing. Let me know if you see this in your account, or if you’re still having issues.
Bianca - did you complete steps 2 and 3 in the challenge instructions? From looking at your challenge account it seems like the 5 restaurant entities still need the Reviews subscription added before the reviews can be pulled into the account.