In stadium, when using the third person perspective mei’s primary fire does not make a hit mark sound when making contact with an enemy. There is no indication that you are spraying a target instead of the air unless you look at the health bars, which also makes it difficult to gauge how effective her 6m primary fire extension power is. The secondary fire icicle sound works properly when it connects with an enemy, but there is no way to tell if you’re aiming well with her primary fire.
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This is also mentioned here:
Hello, there is also a similar issue with the perk ‘Deep Freeze’ sound effect (when the enemy stops moving) and with the minor perk where the icicle slows an enemy (in all other game modes). There is no sound for this… Sounds were working well in season 15 though. A related topic here: https://us.forums.blizzard.com/en/overwatch/t/meis-freeze-sound-missing/960822