Yes, text credits are required for two reasons:

When you activate 2FA (as a Site Admin) and/or setup 2FA (as a user) we need to verify your mobile number. To do this we send you a verification text with a 4 digit code that you need to enter into WriteUpp. This is one-time process and ensures that the number we have for you is a) valid b) in your possession c) capable of receiving your six digit code via text if you are unable to access the authenticator app.

If you are unable to access the authenticator app on your phone (for whatever reason) you can request the code to be sent to your mobile via text.

Any codes requested via SMS for the purposes of two factor authentication will be deducted from your text credit balance.

If you don't use text credits you can buy a small bundle of 50 credits if you intend to use 2FA - How much do text credits cost?

Please keep in mind that the number of text credits required will increase if:

you have a large user population
your users frequently request their codes via SMS rather than using the authenticator app

Codes should accessed using the authenticator app as the first point of call. Codes should only be requested via SMS as a backup option.
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