Teamviewer's quick support or Anydesk,etc do not work for remote controlling a device with android 9 or pie. I know it's a pie only thing because I've tried on a android 6, 5 and jellybean device and it worked fine. I'm assuming this is due to one of the changes brought in pie.
I've searched for any information on this, going past blog articles and youtube videos that explain how to remote control a device, but they again use a non-pie device, as a further proof to this, and not a single place uses pie or addresses any of this anywhere. Other forums also don't seem to contain any information on this. Either that or google is geo-restricting my search results. Either way, I'm not getting anything that addresses the cause of the problem here.
My device is poco f1, a xiaomi device. Teamviewer does not support Xiaomi. Pie is 3 years old now, there is no way that no one noticed this earlier. Do other pie users from other manufacturers not have this problem? If so, custom Roms should fix it right? I know I'm missing something here that I just can't find.