I can’t get any of these combinations to work:

Dimmer top wire wired to red tagged wire
Dimmer bottom wire to black and white wires
2nd switch black and white and red capped

Dimmer bottom wire wired to red tagged wire
Dimmer top wire to black and white wires
2nd switch black and white and red capped

Dimmer top wire wired to red tagged wire
Dimmer bottom wire to black and white wires
2nd switch black and white capped
2nd switch red capped

Dimmer bottom wire wired to red tagged wire
Dimmer top wire to black and white wires
2nd switch black and white capped
2nd switch red capped

All four of those combinations don’t work.

This sucks. What else should I try?