DJI Mic 2 not connecting to Osmo Pocket 3: fix

DJI Mic 2 most often fails to connect to an Osmo Pocket 3 because the transmitter is still in receiver mode (green light) instead of Bluetooth mode (blue light). Start linking on the Pocket 3 under Wireless Mic, hold the transmitter's record button for three seconds to switch to Bluetooth, then hold its linking button for two seconds. A solid blue light means it's connected.

Link Mic 2 to Osmo Pocket 3 — Linking steps from DJI's Osmo Pocket 3 manual. The transmitter links straight to the camera over Bluetooth, no receiver needed.

How the connection works

The Pocket 3 doesn't use the Mic 2 receiver. Each transmitter links straight to the camera over Bluetooth, and the Pocket 3 can take two transmitters at once (TX1 and TX2). A transmitter can only be in one mode at a time:

Green light: receiver mode, looking for the Mic 2 receiver
Blue light: Bluetooth mode, which the Pocket 3 needs

Pressing and holding the record button for three seconds switches between them.

Link step by step

From DJI's Osmo Pocket 3 manual:

On the Pocket 3, swipe down from the top of the screen, tap the settings icon, and select Wireless Mic > TX1 (or TX2). The camera is now waiting.
Press and hold the transmitter's power button for two seconds to turn it on.
If the transmitter's light is green, hold the record button for three seconds to switch to Bluetooth mode.
Press and hold the linking button for two seconds. The light blinks blue quickly while it searches.
When it turns solid blue, the camera shows the connection. Press the transmitter's linking button to start and stop recording on the camera.

If you bought the Pocket 3 and Mic 2 transmitter together as a combo, they're linked already, and the transmitter connects automatically when powered on.

Still won't connect

Update both devices. DJI added Mic 2 features to the Pocket 3 in firmware updates that also list a minimum transmitter firmware. Update the Pocket 3 in the DJI Mimo app, and update the transmitter by computer: see DJI Mic 2 firmware update.
Unlink it elsewhere. A transmitter already connected to a phone over Bluetooth won't pair with the camera. Turn off the phone's Bluetooth or forget DJI-MIC2.
Use the right slot. If TX1 is taken, link the second mic as TX2.
Restart both. Power cycle the camera and the transmitter, then start again from step 1.
Charge it. A solid red light means 0 to 10% battery.

Connected but no or poor audio

Once linked, open Wireless Microphone in the Pocket 3 settings to set monitor volume, Low Cut and 32-bit float backup. Turn on Audio-to-video Sync if you want the transmitter to record its own backup WAV while the camera records. The Pocket 3 can also keep a separate backup from its built-in mics with Built-in Mic Audio Backup. For setup tips, see Osmo Pocket 3 wireless mic.

Want the gear? The DJI Mic 2 pairs with the Osmo Pocket 3 without the receiver, so one transmitter clipped to your shirt is all you need.