Personally I think @bmarple is correct. The main channel now hosts the latest versions so probably no need for testflight at the moment.
I’ve received an email, when I click the view in testflight button, I get the instructions and the redeem code, however…
I installed testflight
entered the code
it then pops up a quick screen & goes back to the enter code screen. I think the message on the brief screen may say “invalid code” I’ve tried the code several times, and nothing happens.
Does anyone have any ideas?