Wyze Thermostat Won’t Turn on After Installation

Anyone have any suggestions for a thermostat that won’t power on? I’ve connected it as instructed, and I believe my c wire is connected properly in my furnace. The power is on, but Wyze won’t turn on. Any help is appreciated! This picture is of the wiring in my furnace.

Is the door to the furnace closed? Often there is a switch that disconnects power when the door is open. The furnace wiring looks ok from here. Do you have a multimeter so that you can check for voltage at the thermostat?

The door is closed, but I am getting really low voltage.

Is this fuse good?