Windows 10 PC screen not projecting

Hello,

For months now, I have been projecting sporting events from my Android 11 cellphone to my Windows 10 computer, because my PC has a bigger viewing screen. But for some reason, my PC has stopped projecting. I get the same message that I was getting previously that my PC is ready to connect wirelessly, but nothing happens. But when I press "Cast" on my phone, 3 or 4 devices show up on my phone that are not in my living space. How can I fix this?

Thank you.