Just to note, extraction works well ( I did the same thing to migrate ) but services with Authy-integrated MFA ( like Twitch ) are "managed" by Authy so it can

Just to note, extraction works well ( I did the same thing to migrate ) but services with Authy-integrated MFA ( like Twitch ) are "managed" by Authy so it can regenerate the secret on the fly and transparently to the end user, at which point your previously extracted secret will no longer be valid. This doesn't affect any of the MFA secrets you manually added to Authy, and these days many of the integrated services will let you additionally add standard TOTP mfa to your account ( unfortunately Twitch still requires you to set up an Authy account first, though )