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OTP and SSPR are two different features. but they both leverage nFactor. Is this what you want to do? https://docs.citrix.com/en-us/citrix-adc/current-release/aaa-tm/authentication-methods/native-otp-authentication.html

Not sure if this is what you are looking for? From https://docs.citrix.com/en-us/citrix-adc/current-release/aaa-tm/sspr-support.html ‘Starting from version 12.1 build 51.xx, alternate email ID registration can be done as standalone. ‘? Maybe…

Yes but I think there's an option with SSPR to require an OTP sent via email isn't there? I've only seen examples using the email OTP in conjunction with security questions. Is there a way to just use the email OTP without security questions?

this is sth we've been looking for too... the security q's are "a bit" clumsy

Think this might do the trick https://docs.citrix.com/en-us/citrix-adc/current-release/aaa-tm/authentication-methods/email-otp.html#only-email-id-registration Going to try this process out in the lab.