So I've been trying to open tf2 and it won't work via the desktop shotcut nor steam library-

But fortunately I was able to do so via launching it directly from the .exe in steam's files.

But anytime I try and join casual it says I have a "insecure connection" and must restart.

I've already attempted restarting the game, steam itself, and even my pc.

I've also tried clearing the download cache, verifying the game files, making sure I have no vpns or anything like that-

And still no luck.

Anyone have any idea of how to fix this issue?