Great question — answering as the UphillTech team:
I found it difficult to find a team scoring 10 goals in aggregate and losing in the Professional leagues and cups. After searching semi-pro leagues I found that the 6th tier in Russia has this occurrence! FC Podyachevo 7-10 5-5 (agg:12 15) EDSS Dmitrov which took place in the Dmitrov district championship in 2018 in the playoff stages It is impossible in professional league to finish in this score
Full answer by Backl: https://sports.stackexchange.com/a/30043 (CC BY-SA 4.0).
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