The invite link Join the Bunpro Japanese SRS beta - TestFlight - Apple now indicates that, “This beta is full.” I couldn’t find any discussion on this topic. Is this limit expected and, if so, will it continue? Other links I found suggested that any user can install the app.
I’m having this same problem and would also like to know
Unfortunately Apple only lets us have a max of 10k testflight users. We periodically remove old unused test account so there are openings from time to time. That being said, we are working on a few final areas and then will be fully publishing to the app store.
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Cannot wait !
We have removed old users, but it takes up to 24 hours for apple to update their data 
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