TaxAct supports the use of several different third-party authenticators. For common issues that arise during verification, please see the troubleshooting links for each authenticator below.
Duo Mobile
https://guide.duo.com/common-issues
Authy (mobile devices only)
https://help.twilio.com/categories/19752372315419
Google Authenticator
https://support.google.com/accounts/answer/185834?hl=en
Microsoft Authenticator