The All-Access Pass was an annual subscription (not a permanent service) and a service provided by Twitch, not Blizzard Entertainment. The subscription is now expired. There were different All-Access Passes; one for the 2018 season and then a different one for the 2019 season. Every user had to get a new All-Access pass in 2019, even if they had the 2018 one.
As of this time there will be no premium subscription service for the 2020 season, however you can learn about features and changes with streaming the Overwatch League on YouTube in my guide here: