This addon requires pas.plugins.tfa Plone addon plugin.
Add this addon to volto project, just update package.json:
"addons": [
"@plone-collective/volto-tfa"
],
"dependencies": {
"@plone-collective/volto-tfa": "*"
}
Go to /tfa-preferences and follow the on screen guidelines.
Note: In order for this addon to work, you need to create a Plone user. Zope manager admin/admin won't work
For more details refer Setting up pas.plugins.tfa on Classic UI