Paul Heckingbottom has been banned from the touchline for two games.
The Barnsley boss was sent to the stands in the win over Millwall before the international break and was today given notice of his suspension.
Heckingbottom admitted after the game at The Den that he was baffled by the decision to send him off, which came during the break after Lee Gregory had scored was was felt a softly-awarded penalty to cancel out Tom Bradshaw's opener.
"I made sure none of the players went up to the referee at half-time," said Heckingbottom immediately after the eventual 3-1 win. "The staff's job was to get them all away from the referee and I just approached him by myself.
"When I came out in the second half to go in the technical area he told me I couldn't go in there. I didn't want to make a scene, but I don't know why I wasn't allowed to be in there in the second half.
"It was a clean tackle (from Matty Pearson), we could all see it. When I watched it back it is so apparent with the Millwall players' reactions, but the linesman's flag went straight up.
"They were given the penalty before the referee could even make a decision. It's just one of those things."
However a brief statement on the Barnsley website said Heckingbottom admitted the charge and that "the Club respects the FA’s decision."
Heckingbottom will be absent rfrom the sidelines for Saturday's match against Middlesbrough at Oakwell and next week's clash with Hull City, also at home.