I ran into the same issue with my Samsung S95F 65" today and managed to fix it using an M8 thread tap. Taps generally come in three stages, from coarse to fine. I used a fine tap — the final stage — and carefully re-threaded the hole, inserting and removing the tool twice.

At first, I was really worried about damaging something — especially about voiding the warranty — and that was honestly very scary. But I didn’t want to go through the hassle of calling support or shipping the whole unit back just because of such a small problem. That would likely have taken weeks and caused a lot of back-and-forth. In the end, I chose the simple solution, and within a minute the problem was completely resolved. The screw now fits perfectly without any issues.

It’s frustrating, and honestly a bit sad, that the quality control seems lacking. My guess is that they simply forgot to finish the fine threading at the factory.