Did you take a look at the topics I linked in Two-factor authentication method for additional security during login - #4 by Moin ?
The video was very helpful for me.
You can also set up two-factor authentication for a test account to try without enabling the setting which forces staff to enable it. When you enable the setting, you have to set it up for your account if you haven’t done so before; you can’t do anything else on your site until you’ve done that, not even disable the setting.
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