Configure verification codes
Set rules for one-time passcodes (OTPs) used in authentication and verification for users in a specific Identity Pool.
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Go to Tenant settings > Identity Pools > [Selected Identity Pool] > Sign-in and Sign-Up. 
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Expand the Verification Code Settings section. 
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Configure one-time passcode (OTP) settings, including expiration time and length, for various authentication and verification scenarios.  
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Save your changes.