Yes, the DJI Mic 2 is compatible with the DJI Osmo Action 5 Pro.
DJI's own OsmoAudio direct-connect ecosystem lets DJI Mic 2's transmitters pair wirelessly straight to Osmo Action 5 Pro with no receiver and no physical port needed -- a cleaner connection than GoPro's Media-Mod-accessory approach. DJI's own product page explicitly names Osmo Action 5 Pro in its direct-connect compatibility list.
“DJI Mic 2 supports the DJI OsmoAudio™ connection ecosystem. DJI Mic 2 transmitters can directly connect to Osmo Mobile 8, Osmo Action 6, Osmo Nano, Osmo 360, Osmo Mobile 7P, Osmo Action 5 Pro, Osmo Action 4, or Osmo Pocket 3.”
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Confidence: high confidence