FH4 crashes at launch

As soon as I start FH4 via Steam, it just freezes on the start screen.

It then either crashes or hangs indefinitely. I have already created a ticket for this problem and followed all the guides available for this problem. I also read that people with NVIDIA GPUs had similar problems, but those seem to be outdated.

So I was wondering if any of you have experienced similar errors/crashes. If so, were you able to fix it?

I appreciate all your efforts!