This is a very old problem - been around since VERY early in Wyze. Very little that I have found that will reliably get a camera in this state to start showing online other than waiting. Maybe a few hours, maybe a few days, maybe a few weeks. I have 34 cameras and at any given time, most of the time, there is at least one that shows offline, but is actually working just fine.
A lot of people reported this issue after the recent Amazon Web Services outages.
Only one of my cameras had the problem, which included the inability to be used with Alexa “show” commands. This was the case right up until yesterday when I powered it off and then back on. Working fine again today with Echo Show.