To complete the thread, I did change the name on one of the rooms and received the following email from OnPeak the next day:
Hello,
Thank you for contacting onPeak, the official housing provider to forward-thinking travelers.
Our records show your duplicate reservation has been revised. We apologize for any inconvenience incurred. An updated reservation confirmation has been sent.
Thank you and please let us know if you need any additional assistance.
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No Names - Duplicate Help Desk
[email protected]