Two-factor and three-factor authentication FAQ
Updated at:
This topic addresses common questions about two-factor and three-factor authentication.
Can I use a Mobile Virtual Network Operator (MVNO) number for three-factor authentication?
Three-element verification is not supported for MVNO phone numbers.
Are there query frequency limits?
Some carriers impose query frequency limits. To prevent service disruptions, do not query the same number repeatedly within a short period.
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