MFA-Duo - Multiple Duo Accounts on a Single Device
The Duo mobile app supports multiple accounts on the same device. If you have more than one login that requires MFA-Duo, these accounts can all coexist in the app.
For some information, see: https://duo.com/blog/duo-mobile-now-supports-multiple-accounts.
For an example of what a Duo mobile looks like with multiple registered accounts, see https://uit.stanford.edu/service/authentication/twostep/multiple_accounts.