The Barnet player boss was dismissed for two yellow cards during Saturday's 3-2 defeat by Accrington.
Barnet appealed against one of the bookings, claiming it was mistaken identity.
But the appeal was dismissed and the Dutch legend will now serve a two-match ban for his second red card of the season - the first also coming against Stanley in November.
Davids will miss Tuesday night's match against Fleetwood and Saturday's clash with Cheltenham.
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