I am going to assume you are asking this for use in a European electrical system. Unless you can find markings on the light or its packaging indicating that it will function on 240V as well as 120V, then it was probably designed for 120V only. In that case, plugging it directly into European mains voltage may well destroy the electronics in the bulb and possibly even cause a fire. The only known safe way to use this in Europe would be with a step-down transformer or by having a capacitor in series in order to limit the current.
Have you tried a non LED bulb to insure that the timer is working properly?
Most dimmers on the market today, state they are for incandescent or LED. In addition, most LED's rated dimmable have circuitry in the bulb to prevent flicker when using old dimmers. Just check the bulb or dimmer packaging, products are advancing and changing rapidly.
The dimmer compatibility guide can be found at https://www.usa.lighting.philips.com/support/support/literature/dimmer-compatibility-guide