Ensure that you are either sitting on the bidet as when you use it, or you can also place a wet towel on the seat between 3- and 5-o’clock.
If the dryer starts up but you can’t feel the air, the dryer flap may be stuck down.
Check the little flap covering the air dryer vent. Occasionally, some dried urine may accidentally splash up causing the flap to stick. Lift the dryer flap and wipe underneath with a damp cloth.