If you do not have a smartphone or don't want to have a one-time-password (OTP) application on your smartphone, then below are some options available which will be helpful.
Microsoft Windows:
A standalone app which does not use a web browser.
https://apps.microsoft.com/detail/xp9mcl9t4jfz0b?hl=en-us&gl=US
iOS, Android, and website accessible:
Authy has an Authenticator app for both iOS and Android devices, and can also be accessed via a web browser.
Google Chrome extension addon:
On-the-fly generator:
If you have your 2FA secret but not your phone, you can use the following to generate the necessary 30-second code immediately.