There are many possible reasons why you can’t connect. You can go to the Wyze support pages for troubleshooting tips.
But the fact that at least one camera isn’t recording to the SD card leads me to believe that the SD card either failed or there’s something wrong with its format.
I posted In another thread before, that as part of the “authentication” process, the Wyze app checks the SD card, and if there is a problem, the authentication fails and you won’t see a livestream.
You can easily check this if there’s someone onsite to remove the SD card. It should let you view the camera. If this fixes the problem, either reformat the SD card on a PC or preferably, use another (better) SD card.