Convert Authtoken to OAuth

Convert Authtoken to OAuth

When I was converting a Authtoken to OAuth, There is a error, below 

This is the first conversion. Why does this error appear? And, I think I set the params right.

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        Overview of SMS-based OTP MFA mode The SMS-based OTP MFA method involves the delivery of a one-time password to a user's mobile phone via SMS. The user receives the OTP on their mobile phone and enters it to sign into their account. SMS-based OTPs offer

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