There have been numerous threads about the Smoke/CO2 alarm function and I believe in most cases it was either a configuration issue or the alarm was emitting a frequency that the Wyze Cam did not recognize:
I recall seeing a post that actually listed the frequency/pattern the Wyze Cam is listening for, but I can’t seem to locate it at the moment. 3100Hz was the standard frequency mandated for smoke alarms but some newer smoke alarms have low-frequency 520Hz or dual-mode alarms.
I have personally received smoke alarm alerts from my Wyze Cam v2s so I know it works, but there may be some changes necessary to make it a more robust feature.