Meta Quest 2 not pairing/ casting

I have a Quest 2 which I hadn't used in at least 2 years. After doing all the updates I restarted using it. I wanted to cast either to the app or mobile, non are working. When wearing the headset it says "Casting to web/ or mobile" but it doesn't cast anything. 
On the app it shows "searching for headset" all the time. At some point it says the headset is linked to another account. However I see the headset connected on the app. 
On mobile it says "streaming interrupted". So none are working. 

I have already done a factory reset. All my accounts (facebook, instagram) are connected I don't have any other meta account and I bought the headset new. I cannot get to support, when I type in the serial number it says it doesn't exist, which is b***bleep**. 

I read somewhere it might got "stuck" in the backend and might have to be manually "cleared" by meta, but I am not getting any option to contact them.

Any ideas? I have lost all patience after more than 4 hours of trying everything.  Please help!