Apologies for the delay, I saw your comment just now.
1) Yes, you can access it from any iOS/Android or Windows device.
2) Yes, an OTP account is actually your in-game account. You can simply activate OTP on both accounts but you can't use the same authenticator for more than a single account so if you have two accoutns you would need to use more than a single device.
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- [GUIDE] How to use OTP on the same device more than once