Game says I cheated, even though I didn't.

May 5, 2021
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Gamertag
Largo9933
#1
So I tried my first experience here with Project Cartographer, and when I joined a game, the game froze, and I also go a message saying that I shouldn't cheat, since this isn't Halo 5 (which I agree with). However, the only thing I did, was to change display from windowed to fullscreen. Perhaps that's what caused it? And if so, will I get my account banned anyway?
Thanks in advance.