FWIW... from
https://www.coachesvoice.com/tactical-analysis-tottenham-2-bayern-munich-7/
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Tottenham started with a four-diamond-two formation that featured Dele Alli at the peak of midfield, Harry Winks at the base, and Frenchmen Tanguy Ndombele and Moussa Sissoko between them. The hosts also initially used an aggressive press with that same shape, in which Son Heung-min joined Harry Kane on the top line, and full-backs Serge Aurier and Danny Rose were encouraged to advance.
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German champions Bayern Munich were set up into a 4-2-3-1 formation by manager Niko Kovac. Against Tottenham’s diamond midfield, they recognised both the potential for spaces in wide areas and that they could be exploited by switches of play.
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Pochettino’s team attempted to negate their visitors by switching to a 4-4-2 when they were defending
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but Bayern simply adjusted again; Coutinho drifted inside towards Tolisso and substitute Thiago Alcântara to create three-on-two overloads against Harry Winks and Tanguy Ndombele or Moussa Sissoko. Those overloads forced Spurs to become even more compact, and therefore concede further space out wide.