United's youth team were beaten 1-0 at Lincoln City on Saturday.
The Iron started the game well and could have gone in front when first Reece Mosanya's excellent cross flashed across the face of the City goal and then Jack Dyche slipped Kyle Wootton through but his lay off inside came to nothing when being more selfish might have been the better option.Lincoln created chances of their own in a competitive game and posed their own threat at the other end.
On 39 minutes the Imps took the lead when United's back five gifted the home team a goal.
Too many slow, square passes on the edge of their own penalty area saw Iron keeper Pat Weaver receive a back pass. Weaver delayed his distribution and brought pressure upon himself and his rushed clearance fell straight to a City player who tucked the ball away from just outside the penalty area.
On 63 minutes United made a double substitution to try to inject energy in to their game and this saw U16 Lewis Butroid make his debut as one of the subs at this level.
United started to create goalscoring opportunities and two fell to the feet of the usually clinical Wootton but both chances were missed as United slipped to only their third league defeat of the season.
Academy Manager Tony Daws said: "It's not often I say this but Paul Harsley and I were disappointed with our individual and team performance today.
"We usually play at a good tempo and move the ball around and up the pitch with a purpose.
"Our boys didn't do that today, uncharacteristically there was a lethargy about our play and we never got going in the manner that we have come to expect."