After logging into your Publishwide Sync App, use your Amazon KDP credentials to log into your Amazon account:
The app may ask you to enter a six-digit OTP (One Time Password) code when you first log in:
NTOE: If you’ve enabled 2-Factor Authentication, the OTP will be texted to you. Otherwise, you should receive an email from Amazon with the code.
Once you’ve entered the code, press Submit to continue.
Publishwide Sync app always requesting an OTP when it syncs? Click here for a solution.