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No - your Duo application can handle multiple accounts - simply add RDCRN to your existing Duo app.
How can I install Duo on an additional or new device?
As long as you still have access to the device you used initially, you can just follow the “Add a new device” link on the Duo login prompt screen to add a new device. If you no longer have access to the phone you used initially, then please contact the DMCC with your new phone number and phone type (iPhone or Android) and we will help you out.
What if I lost or sold my device and would like to add a new device to my RDCRN Duo account?
Please contact the DMCC if you need to add a new device to your RDCRN Duo account - you’ll need to send us your new phone number and the type of device (iPhone, Android) that you would like to use going forward.