Once the admin has enabled 2FA on Workforce you will be prompted to setup 2FA on login.
You will need to download an Authentication app such as Google Authenticator, Microsoft Authenticator, Last Pass etc.
In this case using the Microsoft Authenticator.
2. In the Authenticator App, Click the 3 circles at the top right.
3. Tap "Add Account"
4. Tap Work or School Account.
5. Tap Scan a QR Code.
6. Point the camera to the QR code at the WorkforceTNA screen on login.
Once complete you will have a WorkforceTNA authenticator.
7. On the main screen tap on WorkforceTNA.
8. Enter the one time password into WorkforceTNA.