If the cam is recording events, it has power, is connected to the base station and has no problem uploading to the cloud. That leaves the connection between phone and cam for live streaming. Try rebooting your phone/tablet. Have you tried accessing the cam from a different viewing device?
No, there is no app for Windows. Only web access (Wyze Web View) from a web browser on your PC and the cams must be subscribed to Cam Plus and the functionality is limited, including not being able to access battery-powered Cam Outdoor v1 & v2.
There are several other methods for PC viewing of cams, but all are somewhat complicated and all have cons. If you’re running Windows 11 and have the horsepower to drive multicam streaming, you can also load Windows Subsystem for Android and run the Wyze app.