MLB.tv is available for purchase on Amazon Prime. If you already have its subscription, you can watch MLB on Amazon Prime by following these steps:
Click the “Get Started” button.
Sign in by entering your Amazon Prime credentials.
Register or sign in with an MLB.com account to link your Amazon Prime account.
Once done, use your MLB.com credentials to access MLB.TV on any of your supported devices.
However, keep in mind that MLB.TV is subjected to regional blockages and doesn’t offer to stream out-of-market teams’ matches like Toronto Blue Jays in Canada. That’s why it’s recommended to use a VPN to pass through these blockages and watch your favorite matches without interruption.