Ring wired doorbell cannot enter setup or resetted

Just installed ring doorbell wired 2021 and it’s stick of blue rapid flashing mode, not entering setup or responds to long reset button. Any idea what else can be done?

The doorbell is powered from 18V AC Transformer (500mA) connected to a 50W-250R resistor (no chime)

Video: Streamable Video

As this was just installed, allow the Video Doorbell Wired some time to receive and collect power. After waiting about an hour, attempt setup again to see if it will enter setup mode as intended. If pressing the setup button does not result in setup mode, try powering down the Ring device for a moment, then repeating the steps above after powering back on.

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