My controller will not connect to my Xbox One X

Yes I connected the controller to my PC and it's working fine. And yeah, my Xbox One X is close to my PS3, PS4, TV, and PC. But even with my past Xbox One X system that was placed beside my other systems and didn't have this problem. So, what can we do?
Because yesterday I did the reset thing and the controller connected to my Xbox One X and now same problem. Any help? Thanks.

My sync button turns off my Xbox one X and won't connect any controllers.

When controllers do connect they disconnect and flash.

Had this problem since beginning of February.

My controller stop working too series x , factory controller . Last night working and today my samsung tv remote control my xbox and the xbox controller no longuer view by the xbox , i use another controller from my other xbox seris s , and this controller work but not the one work last night , i try the little button to match xbox with but nothing , the controller do no longuer view on my xbox series x , can control de series s but can't be view or connect to the series x anymore

I want to play an Xbox 360 game with split-screen on my Xbox One X. For the primary account signed in, I can use the wireless Xbox One controller that came with my Xbox One X. But I would like a guest to be able to use one of my Xbox 360 controllers, as
I only have one Xbox One controller. I have a 3rd party (USB) wired and other official wireless Xbox 360 controllers.

I tried using both of these Xbox 360 controllers to try and connect to the Xbox One X using the sync feature but none of them connected. The lights on the Xbox 360 controllers just flash infinitely.

I did hear that Xbox 360 controllers are not compatible with Xbox One’s but does this apply to the Xbox One X as well?

I also tried using the stream Xbox → Windows 10 feature and plugged in my 3rd party USB Xbox 360 controller to my PC which did connect to my Xbox though streaming, however it kept overriding my Xbox One controller by connecting as player 1. I
need it so one of them is player 1 and the other as player 2 so two of us can play split screen.

Is this at all possible, using an Xbox One and Xbox 360 controller?

Thanks.

Maybe you can achieve this using console streaming to PC and connecting both controller to your PC, so the PC have 2 different controllers plugged in and you can use with 2 different player.

As additional info, every Xbox One wireless controller can work as a wired one using a simple USB cable.

I was playing call of duty black ops 2 on my Xbox x and my controller acted like I pushed my analog stick to the right without me actually doing it and then my controller disconnected and now none of my controllers will connect to my Xbox x