Wondering if anyone can suggest a solution to this... I have a microphone extender cable that I've plugged into the Pocket 2 while using the wireless microphone module. As soon as I plug the cable in, it disables the wireless microphone and treats that cable as a headphone input.
Ultimately, I'd love to be able to connect a Rode Go transmitter into the headphone jack and then plug my headphones into the receiver (giving me wireless headphones for monitoring the wireless microphone).

Would appreciate any suggestions or insights into how to make this possible. Thanks!

Just a thought, maybe the polarity of the cable connection is reversed.

Normally headphones and microphones have different impedance values with microphones on average having a higher impedance value than headphones. If the auto detect is registering a higher impedance value due to the resistance of having additional cable length and possible additional poor connection between using an extra connection in the lead, that could fool the input into thinking it was a microphone.  A better lead or connectors may rectify the problem or it could just be the lead has a different impedance value.
Why did you call it a microphone extension cable? Was it sold as such?
Ray.

I have to say that the original post seems seriously muddled about microphones, headphones, inputs and outputs - some clarification might be good.

Figured it out. I needed a connector that the Osmo Pocket 2 would recognize as a headphone when I'm using the wireless mic. Found one that was polarized correctly to do the trick for me.

Glad you fixed it.