The workflow popup for an approval requiring authentication using a signing token will display a credentials option for a token.
Add your username and the 6-digit signing token displayed on in your authenticator app.
The Approve and Reject buttons become active when a signing token and username are added.
The credentials are validated when the user undertakes the approval decision.
An invalid credentials screen message will be displayed if the username added has no valid signing token set up or the signing token code is incorrect or exceeded its time-based validity.