How do I set up more than one device to use my OTP?

The One-Time Password (OTP) is tied to your NCEdCloud ACCOUNT, not to a device.  Therefore, when you login the first time after MFA is implemented (or after an OTP Reset) and see the OTP Setup Page, the QR Code and the AlphaNumeric Code below it are what links the NCEdCloud MFA to the 6-digit code presented by your authentication application (Google Authenticator, RapidIdentity, Authy Desktop).  The QR code and the AlphaNumeric Code are "identical", as far as providing the same information to authentication apps - as long as they're taken from the same OTP Setup page.  Therefore, you can use the same authentication app on your phone to login to your iPad or your Windows machine.

If you're using Authy and have it installed on more than one device, that will work.  But you'll need to enter the same alphanumeric code you got from the original OTP Setup Page into each instance (write it down or take a picture with your phone).  However, if you're using more than one device it's going to be easier to install the app on your phone and have just one place to go for your 6-digit code.