Answer of your leaving message
Blue light comes on but then turns itself off. Can't activate it. Doesn't even show up in my app.

by vicky minich

Dear Vicky, thank you for contacting.

You may check the AC adapter and cable first. (Use mobile phone set to cross check)

If not helpful,
For iSensor, the only way to verify if it still works is :
B.2 INSTALL : or

If the blue light is not blinking for new installation after RESET, the camera may have internal component defective.

Thank you for kind understanding