https://techcrunch.com/2020/05/27/amazon-hbo-max-fire-tv/

WarnerMedia’s new streaming service HBO Max launched today with couple of conspicuous absences from the list of supported devices — Max is not yet available on Roku or Amazon’s Fire TV.

It sounds like this isn’t just a technical issue that will be fixed imminently. WarnerMedia’s vice president of communications Chris Willard told USA Today that “there is no deal in place” to bring the service to those platforms.