Hi, I was left out during the Flight on the weekend for no apparent reason. My Insider profile is in order, I was participating just a few weeks ago in the MCC S8 Flight, so there should be no issue. I have checked every possible source where an invitation could be hiding, so no, I have not overlooked it. This is especially disheartening when 343 stated that everyone will be invited this time.
Now I am trying to gauge if I was just really unlucky, or if it’s a widespread issue. If you were locked out for no reason, please comment and share your experience without bashing or accusing 343 of anything. If anyone has any pointer of what the issue could be, don’t hesitate to leave suggestions.
I was locked out, but it turns out my DxDiag was out of date by a few years. The graphics card carried in the info was not supported for the flight. I did fix it, but it was too late, and I got left out while virtually everyone got to play the flight. 
I hope I don’t get overlooked if they do another one!
I was left out as well. Got an invite, but no code, no message, nothing. This was the first invite I got that I actually had time to play.
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> I was locked out, but it turns out my DxDiag was out of date by a few years. The graphics card carried in the info was not supported for the flight. I did fix it, but it was too late, and I got left out while virtually everyone got to play the flight.
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> I hope I don’t get overlooked if they do another one!
Same situation here, there was a weird glitch going on with my account where my new dxdiag was reverted/replaced to my old one for the whole weekend and it had an R5 M335 (which is horrendously low end for the game). My new one was with RX 5600XT which I got a few weeks ago, but it just somehow erased my new dxdiag with my old one, I got to know about it on Friday, this was probably the reason I was excluded for this flight. I updated it with my new dxdiag with the RX 5600XT, hoping to get into the next BTB flight… quite disheartening to see me feeling left out when virtually everyone’s playing the flight… , but I hope all of us would be selected for the next flight and enjoying it in the next weekend!!